A BICOLORED GYNANDROMORPH OF THE LOBSTER

Lobsters with sharply defined, bilateral color differentiation have been described by several authors. Herrick (18%) mentioned the following variations of this pattern in both the American and the European lobster: half normal color and half light sky blue; half normal and half pale red; half greenish black and half light orange; half blue and half white; and half light yellow and half bright red. Schaanning (1929) gave a color figure of a European lobster that was light red and dark blue. Templeman (1948) added records of two more bicolored American lobsters, one normal and red, the other whitish red and purplish blue. Such color variants have occasionally been referred to as gynandromorphs or hermaphrodites, but there is no evidence that any of the previously recorded bicolored specimens were also bisexual. Only two cases of possibly complete hermaphroditism have been recorded here tofore for Honiarus. Nicholls (1730) described and figured a specimen of the European lobster, H. gatnnuirus, received from Newgate-Market, London, that displayed all of the external and internal female characters on the right side and all of the male structures on the left. Halkett (1919) collected a specimen of H. americanus at Bay View, Pictou County, Nova Scotia, November 1917 “? which was absolutely male on the left side and absolutely female on the right side―; this specimen was sent to Queen's University, Kingston, Ontario, but apparently no complete description of it has been published. Gordon (1957) described a speci men of H. gann this specimen was not dissected, but Dr. Gordon suggests that “? it probably has a normal ovary on the right side and part ovary, part testis on the left side—or a testis with ova in the anterior position.― Herrmann (1890) discovered that eggs are occasionally developed during spermatogenesis in the lobster testis but he gave no indication that this was associated with any unusual external charac teristics. Finally, Ridewood (1909) recorded an ovigerous specimen of H. 9am @narus,presumably from off the Orkney Islands, that had genital openings on the third right pereiopod and on the fourth and fifth left pereiopods, but dissection disclosed only a normal paired ovary with apparently three oviducts, two of them on the left side leading to the abnormally placed openings. The specimen described below (U. S. Nat. Mus. Cat. No. 102241) seems to be the first lobster to be recorded in which a color anomaly was associated with