412 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



Key to Species of Parasmittina 



1. Ovicell with 2 or 3 large central pores Jeffrey si 



Pores of ovicell more numerous 2 



2. Peristome high, forming a complete tube tubulata 



Peristome not forming a high tube 3 



3. Small, less than 0.45 mm long ; lyrula very broad .... fraseri 

 Larger, 0.50 to 0.60 mm 4 



4. Giant pointed avicularia directed proximally, small ligulate avicu- 



laria at side of aperture crosslandi 



Giant pointed avicularia directed distally 5 



5. Giant avicularia long-pointed or subspatulate, not elevated, 



directed more or less laterally distal to the aperture . californica 

 Giant avicularia with the tip elevated, below or at one side of the 

 aperture, directed distally 6 



6. One to several high frontal tuberosities ; giant avicularia with 



broad triangular mandible, the point much elevated . . collifera 

 No such frontal tuberosities 7 



7. Frontal very thick and covered with small round granules, a 



rounded embedded avicularium at the proximal end . alaskensis 

 Frontal only moderately thick, avicularia diflFerent 8 



8. Primary aperture longer than wide, peristome developed only on 



the sides, avicularia spatulate or oval spathulata 



Primary aperture not longer than wide, peristome usually devel- 

 oped on the proximal border, avicularia pointed . . trispinosa 



Parasmittina trispinosa (Johnston), 1838 

 Plate 49, figs. 7-8 



Discopora trispinosa Johnston, 1838 :222. 



Lepralia trispinosa, Johnston, 1847 :324. 



Escharella Jacotini, Smitt, 1867:11. 



Smittia trispinosa, Hincks, 1880:353. 



Smittia trispinosa, Hincks, 1884:25 ("Several varieties occur.") 



Smittia trispinosa, Robertson, 1908:302. 



Smittia trispinosa, O'Donoghue, 1923 :43. 



Smittina trispinosa, O'Donoghue, 1926:67. 



Smittina trispinosa, Canu and Bassler, 1930:27. 



Smittina trispinosa, Hastings, 1930:726. 



If all the varieties which have been described under this species really 

 belong here, it is probably the most variable species known. It has been 

 given cosmopolitan distribution, which may be quite correct, but it is 



