152 MOLLUSCA OF THE 



where the salivary glands are affixed; these latter are long 

 (measuring about 18 mill.), the ducts are long and narrow 

 (length about 30 mill.). The salivary glands are nearly grown 

 together over their total length, the right half being pro- 

 duced into a point, the right duct is consequently the 

 shortest. The jaw, measuring 5^3 mill, in latitude, is smooth, 

 dark brownish yellow, arched, with rounded extremities; 

 the free margin is provided with a blunt tooth. The radula, 

 which was rather brittle, is about 12 mill, long, with a 

 breadth of about 6 mill. ; on account of their brittleness 

 the margins were generally damaged, and the number of 

 the rows of teeth could not be stated with accuracy ; the 

 largest number of rows in length is about 145, in breadth 

 301; the central tooth of each row is conical, oblong, 

 with one cusp ; the next lateral ones are slightly larger 

 and unsymmetrical but for the rest similar; about the 20*'^ 

 lateral tooth on each side grows more slander , and between 

 the 24*11 and 21^^ a rudimentary second cusp makes its 

 appearance at the outer side of the principal one, and, 

 gradually descending at e^ch successive row , it becomes 

 nearly equal to the principal cusp , from between the 50*li 

 and 60*11 tooth up to the margin. 



The generative organs consist of a hermaphrodite gland , 

 imbedded in the liver; it has a long duct, measuring 40 

 mill, in its natural position, moreover it is strongly twisted, 

 and, if extended, it would be still considerably longer ; albu- 

 men gland moderate, 15 mill, in length, oviduct strongly 

 developed and wrinkled ; upper part of the vagina much 

 swollen ; below this part a short , oval spermatheca , appa- 

 rently without duct , is inserted ; its top is affixed on the 

 ovosperraiduct by a short, broad muscle ; a cylindrical part 

 of the vagina leads to the generative cloak , which has 

 on one side a very long , cylindrical , wormlike amatorial 

 organ , which shows a single coil , and has a muscle at 

 its top; the length is about 85 mill. Opposite to it, the 

 penis is situated , which is bent on itself ; the part adja- 

 cent to the cloak is about 15 mill, in length, then it 



Notes from the Leydeii IMuseuin, Vol. XVII. 



