BULLETIN OF THE 



but it is very likely that it does. What may be the office of these forma- 

 tions I cannot imagine, unless it may be to protect the muscles. In 

 many specimens the nasiform body was crammed with spiculae in one 

 heterogeneous mass, forming an excellent shield for the muscles. The 

 brachial cirrhi before these prominences were very much shorter than the 

 others. I am not aware that these peculiar features have been noticed in 

 any publication on this group. The hepatic digitations enter the stomach 

 by two ducts on each side as in W. Jloridana, but are longer and more 

 slender than in that species. The seta? are longer and more closely set in 

 front than at the sides ; they rarely are double in the same follicle ; and in 

 no case were more than two so noticed. They seemed to be almost uni- 

 formly broken off just beyond the edge of the mantle, but in those 

 which remained unbroken no transverse markings were seen. A few dark 

 pigment granules were noticed around the bases of the follicles, and a line 

 of similar granules was seen between each two seta?, passing round the 

 bases- of the follicles and joining the next line, and so on continuously. 

 The eircumpallial muscle was narrow and slender. 



No peculiarities of note were observed in the shell structure. The per- 

 forations appeared to be slightly further apart than in T. vitrea, but the 

 difference was not much greater than that which may be observed in the 

 shells of different individuals of the same species. 



The external layer, mentioned by Hancock as occurring at the edges of 

 the shells of other species, was well marked in perfect examples, and 

 extended over a large part of the shells. 



Attached to a piece of rock, dredged off the Samboes on the Florida 

 coast, was a minute polished hyaline shell 4-100 of an inch in length, 

 which, from its general appearance and the locality in which it was found, 

 I believe to be the young of T. cubensis. That species is abundant in that 

 locality, and the only other known species to which it might be referred 

 is TT. Jloridana. The latter, even in very small specimens, has quite 

 a different aspect. 



The shell in question was ovate,*with the beak of the neural valve quite 

 prominent, and with a small but sharply defined area. There was no 

 deltidium, and the apex of the haemal valve Avas somewhat prominent, 

 recalling that of an embryonic (?) Brachiopod described by Mr. Jeffreys, 

 under the name of Terebratula capsula. The punctures were very small 

 and widely separated, arranged in quincunx order. The ends of the 

 prisms of which the shelly matter is composed, by impinging upon the 

 surface, gave it a beautifully reticulated or lacelike aspect. By gumming 

 the lower valve to a piece of card, and allowing the end of a thread moist- 

 ened with gum to dry fast upon the upper valve, I was fortunately able to 

 separate the two without breaking them or injuring the remains of the an- 

 imal within. These afforded some interesting notes. 



