OF CONCHOLOGY. 249 



Stoliczka remarks that the genus Pugnellus should be placed 

 next to Strombus, but I think it ought to precede Strombus, 

 being first in the order of time, and a rude forerunner of that 

 genus. 



The same author places Morea, Con., in the subfamily Ra- 

 panidce, but I should rather refer it to Purpuridce. 



6. Note on some Miocene species of Siphonalia. 



I think that three of the Atlantic Miocene univalves may be 

 arranged in this genus: S. (Fusus) rusticus, Con. (not Sow.), 

 and S. (Fusics) trossulus, Con., and S. filicata, Con. 



1. Siphonalia rustica. 2. Siphonalia trossula. 



Fusus errans, Con. (not Fusus trossulus, Con. 



Sow.) 

 F. rusticus, Con. "3. Siphonalia filicata, Miocene 



F. subrusticus, D'Orbig. shells. PL 49, fig. 2. 



The figure referred to above does not represent Fusus filica- 

 tus, which is a species of Peristernia. 



7. Description of a new genus .of Unionidje. 



SOLENAIA. Conrad. 



G-eneric character. — Elongated, thin ; gaping anteriorly ; 

 hinge with a long, acicular, lateral, tooth in each valve, slightly 

 developed. 



Mycetopus emarginatus, Lea. Observations on the genus 

 Unio, vol. x., p. 3$, pi. 50, fig. 305. 



An elongated form of Unionidce has, I think, erroneously 

 been placed by Lea in the genus Mycetopus, D'Orbig. The 

 animal, I am sure, must be different from that of Mycetopus, in 

 consequence of the shell having lateral teeth, in its reflexed an- 

 terior, and in the simple anterior muscular impression so differ- 

 ent from the complicated scar in the latter genus. It is very 

 likely that the animal had a produced foot, but when it shall be 

 compared with the animal of Mycetopus, I think the difference 

 will be noticeable. It is probably allied to Dipsas, Leach. 



In Reeve's monograph of Mycetopus, he includes a shell 

 which is probably an Anodon (Monog. fig. 7), from Australia. 

 The form is very different from the typical species of the former 

 genus, and is much more nearly allied to Gronidea, Conrad, 

 being "cuneate and angular." No notice of the hinge is given 

 in the description, and therefore I cannot point out any other 

 resemblance to Qonidea than the remarkably angular form of 

 the valves. 



