COLLECTED IN DUTCH NEW GIJIXEA. 



297 



species from P. taumantias would appear to be the persistence of an epidermis and 

 the flattening of the body-whorl in P. lituus (PI. XXXIII. fig. 8 a, b, c), while that 

 species lacks the obsolete spiral strise of taumantias. These characters, however, are 

 very slight and hard to reconcile with the strongly marked difi'erences in the genitalia. 

 The account of the radula, jaw, and genitalia here published are, as far as can be made 

 out, the first that have been given. 



The radula and jaw call for little comment, and appear to be quite normal 

 (PI. XXXII. figs. 1, 2j. 



Text-fio-ure 10. 



Genitalia of Papuina litaiis. For lettering, see text-fig. 11 (p. 299). 



The genitalia. — A marked feature of this species is the great length of the j^enis 

 retractor, which is attached to the distal extremity of the penis. There is apparently 

 no epiphallus, unless the modified distal extremity of the penis to which the retractor 

 is inserted represents this (text-fig, 10). 



8. Papuina wollastoni, sp. n. (PL XXXIII. figs. 1-5, 9 a-c.) 



One complete example from between Base and Cano Camps. 



The genus Papuina stands in serious need for a complete revision upon sound 

 anatomical lines. Under the name are classified a great variety of forms, which diff'er 

 widely enough to warrant division into separate subgenera. To allocate a form, 

 therefore, to a genus in this condition is to give but an inadequate expression of its 



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