320 TROCHHLE. 



but in the examples I have examined of the T. magus, T. zizi- 

 phinus, T. tennis and T. lineatus, either in or after the genial 

 season, I have failed to discover any other reproductive organ 

 than the one attached to the branchial leaf, if it be one. All 

 this is so opposed to the dictum of M. Cuvier, that the TrocJii 

 and all the Pectinibraiichiata have the sexes distinct, that 

 one cannot help having suspicions that, notwithstanding the 

 strong, almost convincing facts adduced, an error lurks some- 

 where, though I cannot at present detect it. 



September 1852. 



Since the above was written I have examined numerous 

 specimens of Tr. lineatus, with the same result as above 

 stated ; and I have to report in addition, that I think a simple, 

 short and direct oviduct may be traced from the ovary to the 

 canal of the matrix. I have also compared the contents of 

 the ovary with the white masses deposited on the foot, and 

 they are identical. On the left side of the body, in which 

 the testis is deposited, I think the vas deferens may be seen 

 proceeding in a direct line far without that of the branchial 

 artery, to its issue at the base of the organ attached to the 

 side of the plume, which I have presumed is the organe 

 generateur. 



PHASIANELLA, Lamarck. 



P. PULLUS, Mont, et Auct. 

 P. pullus, Brit. Moll. ii. p. 538, pi. 69. f. 1,2,3; (animal) pi. D.D. f. 5. 



Animal inhabiting a spiral shell of 4-5^ tumid volutions 

 of singularly elegant variations of colour ; mantle grass-green, 

 margin plain. The head is a produced muzzle, truncate, but 

 not cloven anteriorly ; the orifice of the mouth is beneath, in 

 the centre of an area marked with fine darkish radiating 

 lines ; the back of the head and neck show three longitudinal 

 bars of lead-colour, the middle the palest ; the anterior parts 

 have close-set transverse lines of the same colour. The tenta- 

 cula are long, flat, slender, and setaceous, edged with a brown 

 line ; the eyes are at the external bases, on short distinct 

 pedicles, marked with brown and pale green. The buccal 



