336 
On thè genus Pomjyholyx and its Allies, 
effusa. I propose, therefore, to indicate thè species Pomgyhohjx 
Leana, var. solida, until more definite information he ob- 
tainable. 
Tliere can be no doubt that thè anatomy of two sneh closelj 
allied forrns must be nearlj identica!, and there are probably no 
differences in thè soft parts alone (except in thè dentition of thè 
outer laterals) by which thè two species mig-ht be separated. 
A carefni examination of some 30 specimens from among 
those sent bj Mr. Harford from Clear Lake bave afforded tlie 
following notes. 
External goarts. The generai accnracy of outline of thè 
figure given (in thè Proc. Cai. Acad. 1866, p. 268) is fully con- 
firmed. jSTo tentaenlar eyes are present. The foot is short, 
(abont twice as long as broad), posterior extremity blnntly 
ronnded as in PlanovMs. The veil, or lips, are broad and 
semilnnar. The raouth is minute and ronnded-transverse. 
The tentacles are ratlier short, stont and slightly larger at thè 
tips than more posteriorly. Tliey are marked by a centrai line 
of pigment cells which accompany thè tentaenlar nerve, and in 
some individnals, near thè tips, an aggregation of these pigment 
cells, forming a black patch or dot, was observed. This is un- 
qnestionably what was' taken for a second pair of eyes by Mr. 
Gabb. In other individnals, however, thè pigmentary deposit 
was nearly or entirely absent, and thè tips of thè tentacles were 
of a pale yellowish color. The colors, as far as conld be deter- 
minedfrom thè specimens in glycerine, were as represented in 
thè paper alluded to. The true eyes are sessile on thè front of 
thè head, near, bnt not on, thè inner bases of thè tentacles. 
Nermus System. The oesophagus is snrrounded by a ner- 
vons celiar, with one large and one small ganglion, thè lattei’ 
above and thè former below thè throat. These ganglia are 
really composed of pairs, very closely nnited to each other. 
From thè lower one thè tentaenlar and thè optic nerves are 
given ont., ISTervous braimhes radiate from thè ganglia, bnt were 
too minute- to be satisfactorily traced to their terminations. 
