236 ON THE GULAR POUCH OF RHINODERMA DARWINI. [Apr. 1 7, 



least advanced lay (as in Espada's example) at tlie base of the sac 

 {cf. fior. 2). Tlie largest larva measured 8 mm. from snout to 

 vent, 5 mm. across the trunk at its widest part. None were young 

 enough to show the remotest vestiges of external gills, had such 

 existed^ 



Espada found in one instance 15 young in the pouch. These 

 were apparently in a somewhat similar condition to those of my own 

 specimen ; concerning the parent, he writes (Spengel, p. 499), " Die 

 Eingeweide nahmem einen unglaublich kleinen (inverosimill) Raum 



ein bei genauerer Betrachtung stellte sich das Phanomen 



nicht als eine mechanische Wirkung [of the enlargement of the sac] 

 dar, scndern als eine Riickbildung, ein Schrumpfen dieser Eingeweide, 



Fio 



c.a 



Longitudinal section of Bhinoderma darwini entire, taken to one side of the 

 middle line after removal of the embryos; to show the general relations 

 and sectional area of the gular brood-sac {s.g). 



hi, urinary bladder ; h, heart ; l.s' , dorsal subcutaneous lymph-sinus ; 

 ce, (Esophagus ; sh, shoulder-girdle. 



welche wie abgezehrt erschienen. Das Thier muss ohne Zweifel, so 

 lange seine Jungen in dem Brutraume sind, zum grossen Theil seine 

 Erniihrungsfunctionen einstellen, wenn auch nicht vollstandig, wie 

 bei den Winterschlafern." I accordingly examined, with no little 

 interest, the condition of the parts in my specimen ; and this with 

 unexpected results. The small intestine {i.s, fig. 3) was perfectly 

 normal and full of food-material in an assimilable condition, while 

 the large intestine («.Z) was fully charged with excreta like that of 

 a normal individual. The stomach {st, fig. 5) was much distended 

 by small Beetles and Diptera ; and, but that the liver (h.p, fig. 3) was 

 shrunken and displaced, and that the gall-bladder had collapsed, the 

 alimentary viscera were those of a healthy animal in full diet. 



If Espada's final deduction were correct, we might fairly expect 

 to find the fat-body in an insignificant condition ^. This was, on 



^ Espada failed to iind traces of these in still younger larvre. 



^ Cf. Enappe, " Das Bidder'sche Organ," Morph. Jahrb. vol. xi. (1886). 



