26 COCKERELL : ON THE JAMAICAN SPECIES OF VERONICELLA. 



{e.g. Nos. 8 and 9) this condition does not obtain, and the 

 retractor is strictly one. It surprised us to find that this 

 difference (whether one or two retractors) could not be 

 correlated with other characters, and was apparently of no 

 specific value. 



In K dissimilis the two penis -retractors are distinct, long, 

 and slender; and here the character has specific value. 

 (8.) The filiform glands vary in number from about 20 (Nos. 20, 22, 

 and 23) to 47 (No. 10), but from 30 to 35 is the usual 

 number. In length they vary from 3^ (No. 2) to 9 mm. 

 The alimentary canal was found to be practically the same 

 throughout. Some variation was observed in the foot- 

 nerves, but the nervous system was not studied. 



We have no doubt that the species is identical with 

 V. sloanii, which is the same as Blainville's V. Itevis — the 

 type of the genus. Mr. C. D. Sherborn was so kind as to 

 ascertain the approximate date of publication of Cuvier's 

 work, from which it appears certain that the name sloanii 

 antedates hevis by some months, though both were pub- 

 lished in 181 7. 

 Veronicella sloanii (Cuvier), Table of Variations. 



A. Filiform glands 9 mm. long. 



a. Two retractores penis; filiform glands 36; penis slightly curved, 



cylindrical, end bulbous, orifice terminal, length 7J mm. 



Length (in alch.) 45J mm., breadth 14 mm., breadth of 

 sole 5; ? orifice 27 mm. ('59 of total length) from head, 

 1 mm. from sole. Ends rounded, head retracted, end of 

 sole not projecting beyond body. Mantle dirty yellow, 

 with no well-defined median line and no spots ; slightly warty. 

 Beneath pale yellowish-brown, sole concolorous ; cross- 

 lines of sole numerous and small. = No. 5. 



b. One retractor penis; filiform glands about 20; ? orifice 



•56 of total length from head; mantle with a pale median- 

 line and dark subdorsal bands. = virgata, Ckll. 



B. Filiform glands 8i mm. long, 35 in number, one of them 



branched ; penis cylindrical, end bulbous, orifice terminal, 

 length 10 mm. ; length of slug (in alch.) 55, breadth 15, 

 of sole 8 mm.; $ orifice 2>Z mrn - ('6° of total length) from 

 head, 2 mm. from sole. 



Head slightly protruded ; mantle distinctly mottled dark 

 brown and dirty yellow, no median line. Beneath pale 

 yellow, sole concolorous, cross-lines of sole numerous, 

 irregular. = No. 9. 



