FIBULAIUA CUANIOLARIS. 57 



goes. Possibly even this is too large a number, for there is no doubt of the 

 great variability in form shown by craniolaris and volva and very likely there is 

 equal variability in the development of the petals and the size of the pores. 

 Moreover material is scanty and further accumulations may prove the basis for 

 very different conclusions. 



Key to the Species of Fibularia. 



Petals present, more or less well formed; no obvious sexual dimorphism. 

 Pores of petals small, usually much smaller than genital pores. 



Anus large nearly or quite equalling mouth; test flattened, v.d. about .40 test 



length; petals well developed with 8-24 pore-pairs on each side australis. 



Anus very small, not half as large as mouth. 



Test high (v.d. often .80 te.st-length), broad (.80-.90 t.-l.), more or less egg- 

 shaped craniolaris. 



Test low (v.d. about .40 t.-l.) and not very broad (about .80 1. 1.) . . . . acuta 

 Pores of petals few and large, usually bigger than genital pores; anus scarcely half as 

 large as mouth or even smaller. 

 Petals rather short but with from 40 to 120 pores in all five together; test about 



half as high as long volva. 



Petals ill defined, covering most of abactinal surface, with only 30-36 large pores; 



test about two fifths as high as long cribellum. 



Petals wanting; dorsal surface of female with conspicuous depressed brood-pouch . . . nutriens. 



Fibularia australis. 



Desmoulins, 1837. Etudes sur les Ech. Tab. Syn., p. 240. 



This is the largest species of the family, reaching a length of nearly 20 mm. 

 There are specimens in the M. C. Z. collection from the Hawaiian, Gilbert, and 

 Kermadec Islands, but these are all small. The large specimen, figured in the 

 Revision, was purchased in Hamburg and the original locahty is not known. 



Fibularia craniolaris. 



Echinocyamus craniolaris Leske, 1778. Add. ad Klein, p. 150. 



Fibularia craniolaris de Blainville (not de France, as stated in the Revision, p. 129), 1820. Diet. 



f^ci. Nat., 16, p. 512. 

 Echinus ovulum GmeUn, 1788. Linn^. Syst. Nat., ed. 13, p. 3194. (Fibularia ovulum Lamarck, 



Agassiz, Gray, A. Agassiz, et al.). 



I have not been able to find any good reason why ovulum should take 

 precedence over craniolaris as the correct name for this species, as the latter 

 was used in connection with a description and figure, which are as recognizable 

 as could be expected at that date, ten years earlier. 



