M0LLU8CA. 23 



12. Ovultjm ntjbeculattjm. PI. VI. Kg. 12 a, b, c. Ovul. testa ventricosa, sub-pyriformi, pallide 

 rubro vel fulvo nubeculato ; dorso obscure costellato ; canalibus brevibus, vix emarginatis ; apertura angusta, 

 labio externo intus crenulato, prope medium sub-complanato ; labio interne- tumorem elevatum crassum 

 ferente, ad canalem breve et recedente, antice tumido, intus excavate-, ad canalem sub-uniplicato. 



Hab. Isle of Basilan. 



More pyTiform than 0. cameum; posterior canal shorter, posterior tumidity more 

 elevated. The colour consists of pale or strong brownish red, arranged in three cloudy bands. 



13. Ovtjlum BCLLATUSi. PI. VI. Pig. 13 a, b. Ovul. testa ovali-oblonga, minute striata, roseo tincta, 

 ad extremitates fusco lineata : dorso ad marginem sulcato ; canalibus sub-productis, integris ; apertura angusta, 

 labio externo intus crenato, complanato ; labio interno tumido, lsevi, intus depresso, sub-sulcato, postice 

 bullulam prominentem crenulatum ferente, ad canalem sub-tortuoso, antice sub-excavato, ad canalem uni- 

 plicato. 



Hab. Caramata Passage, near Singapore. 



Of an oval form, striated at the back. The inner hp of the posterior canal slightly 

 tortuous, the outer hp flattened, slanting inwards and crenulated, the body whorl in front 

 near the posterior angle having a raised, rounded, prominent pustule. 



Figures all more or less magnified. 



3. CYPILEA. 



Prom the rare occurrence of a new Cypraa it will not be a matter of surprise that no 

 additional species were collected of this genus. Some observations were, however, made at 

 Singapore on the Cowry in its early winged state, which it will be interesting to record, as 

 confirming the following by Professor Edward Forbes in the Edinburgh Philosophical Journal, 

 (vol. xxxvi. p. 326) : " All Gasteropoda commence life under the same form, both of shell 

 and animal, namely, a very simple spiral hehcoid shell, and an animal furnished with two 

 ciliated wings or lobes by which it can swim freely through the fluid in which it is con- 

 tained. At this stage of the animal's existence, it corresponds to the permanent state of the 

 Pteropod, and the form is alike, whether it be afterwards a shelled or a shell-less species." 



While staying at Singapore I had an opportunity, in conjunction with Dr. Trail of that place, of 

 observing the fry of Cypma annidus, the species being then in spawn. Several specimens collected by us at 

 low water were seen to have conglomerated masses of minute transparent shells (PI. V. Fig. 4 a, b, c.) 

 adhering to the mantle and other parts of the animal, which masses, when placed in a watch-glass of salt 

 water, under the microscope, became disintegrated, and detached individuals were perceived quitting the rest, 

 and moving in rapid gyrations, with abrupt jerking movements, by means of two rounded flattened alar 

 membranous expansions, reminding one of the motions of some of the Pteropods. "When at rest they 

 joined the principal mass, or adhered, by means of their dilated expansions, to the surface of the watch-glass. 

 Owing to the deficient powers of the microscope, I was precluded from making further observations, but a 

 small mass of these objects was brought home and is represented in the plate above referred to, 



