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Show 1888.] BROOD-POUCH OF RHINODERMA DARWINI. 233 That author says, in describing its attachments (Spengel's translation, p. 499), "Sie fand sich stellenweise anlie^end, stellenweise vollstandig verwachsen mit der Innenflache der Haut und mit der Aussenfliiche der Brust- und Bauchmuskeln." In m y specimen no such confluence with the abdominal muscles was discernible ; such attachments, however, as were instituted were of a very definite order. Espada states that the sac bears at the shoulders 'Zipfeln'; and this might appear to imply that it is an irregular structure, bearing lateral diverticula and accommodating itself, as it were, to its surroundings. The only fusion with the inner surface of the integu- Fig. 2. The same as in fig. 1, the ventral integument having been wholly reflected, and the gular sac opened up to display its contents. ment observable in my specimen is a bilaterally symmetrical one (figs. 1 & 2) set up near the angle of the lower jaw. The wall of the sac, elsewhere very thin and transparent, is at these points thickened, and, consequent upon its adherence to the integument, dragged out as it were laterally, to form two prolongations which answer very |
