10 ZOOLOGY OP THE VOYAGE OF H.M.S. SAMAEANG. 



funnel was found that part of the cartilaginous cranium which forms the capsules of the 

 organs of hearing : these formed two oval cartilaginous cups (w), their walls confluent at the 

 median line, but their cavities distinct, with a thin semitransparent oval portion on their 

 ventral walls, through which the small opake white otolite within could be discerned : the 

 line is drawn from this thinner part to the letter w, in fig. 15. Behind the ear-capsules 

 emerged the oesophagus, with the slender duct, v, of the large salivary gland, u z, and on each 

 side were the larger pallial nerves, i i ; these indent the sides of the salivary gland in their 

 passage downwards, backwards, and outwards, to penetrate the lateral fasciculi of the muscular 

 investment of the liver. The oesophagus does not expand into a crop or ingluvies, but 

 maintains the same diameter until it terminates in a small stomach, w, which is succeeded 

 by a second cavity of almost equal size, y, forming the laminated or pancreatic sac, which 

 receives the ducts of the liver ; these (c y) appeared to have been beset by numerous minute 

 cystic follicles. The intestine is very short, and makes one slight bend backwards before it 

 advances, as rectum, to terminate in the infundibuliform anus, k, which it forms as soon as 

 it has perforated the peritoneal septum, shown in fig. 11. A very minute pyriform ink-bag, z, 

 is situated close to the rectum, and its duct opens within the verge of the anus. The anus 

 does not protrude and float freely in the branchial chamber, nor is it provided with valvular 

 or filamentary appendages. 



The visceral cavity is continued into each of the terminal lobes of the mantle, as shown 

 in fig. 15, where they are laid open. They were occupied principally by the generative organs, 

 which seemed to be in a feebly developed state. Either from the state of the specimen 

 or my own ill success in the attempt, I could not satisfactorily make out the precise forms 

 and relations of these organs. On the right side was situated the principal gland, either 

 ovary or testis, A, and on the left side there was the chief part of the efferent duct, B, 

 either vas deferens or oviduct, slightly convoluted, and complicated with some other parts 

 where it communicated below, or behind, the intestine with the ovarium or gland on the 

 right side. This gland consisted of minute, close-set, subelongate follicles, with the cellular 

 nuclei of either ova or spermatozoa. 



Prom the acceptable Memoire by Professor de Blainville, " Sur l'animal de la Spirula, 

 et sur 1' usage du siphon des coquilles polythalames," published in the Annates Franchises et 

 Etranyeres d'Anatomie et de Physioloyie, torn. i. p. 369 (1837), we learn, that in the Spirula 

 the funnel has its parietes entire ' (i. e., not longitudinally slit, as in the Nautilus); that the 

 gills are two in number ; that the intestinal canal extends between the two masses of the 

 generative apparatus, is accompanied by an ink-bag, and terminates by a small free floating 

 appendage ; and that there is an ovary and an organ of digestion. 2 



1 " L'entonnoir fort considerable entierement ferine." p. 378. 



2 " Vers le milieu de la face inferieure de la masse viscerale le canal intestinal se terminant par un petit appen- 

 diee libre, flottant, largement ouvert, absolument comme dans les seches, et accompagne dans toute son etendue entre 

 les deux masses de l'appareil generateur, par le canal de la vessie a encre, contenant de la matiere noire que j'ai 



