340 



TAYLOR : ON TESTACELLA SCUTULUM. 



haliotidea, are in T. scutulum scarcely perceptible, and the fine 

 longitudinal stria which aid to form them become lost as they 

 approach the head in the usual somewhat uniform granulation 

 of the anterior part of the body. 





Sexual Organs of T. hahotidea, SexnzX Organs of T. scutulum, from 



from Horsham x iK Chiswick, x 2- 



Sexually mature hence greater ^j^^, ^^^j ^^^ j^g sexually mature, 



development oi lemale organs. 



ot. ovotestis ; alb. g. albumen gland ; ov. oviduct ; sp. d. sperm duct ; sp. spermatheca ; 

 V. d. vas deferens ; r. 7ft. retractor muscle ; fl. flagellum ; p. s. penis-sheath. 



In its REPRODTiCTivE ORGANS, T. scutuliwi differs markedly 

 from haliotidea in the totally and strikingly different form and 

 arrangement of the penis-sheath, which approaches much more 

 nearly to that of T. maugei'' in its general form and comparative 

 simplicity, being long and simple, and though enlarging upwards 

 and sometimes twisted, is without the long and thick flagellum 

 which is so conspicuous a feature in T. haliotidea, the vas de- 

 ferens thus enters the penis-sheath terminally in scutulum and 

 maugei and laterally in haliotidea. The tongue-like csecal 

 process which is so distinctive of the lower portion of the 

 penis-sheath in haliotidea, is quite absent in scutuhim, there is 



* The figure of the sexual organs given by Gassies & Fischer, Monogr. 

 genre Testacella, pi. i, fig. 15, as characteristic of the genus Testacella, and 

 as specially representing those of T. maugei, really belong to T. haliotidea. 

 It seems advisable to correct this grave error, as Signer C. Pollonera in his 

 recently published elaborate paper on Spanish and Italian Testacellse, credits 

 T. ?naitgei with the possession of a flagellum, apparently on the authority of 

 the aboye-mentioned distinguished authors. 



J.C., v., [uly, i888, 



