NO. 5 RHYNCHONELLOID BRACHIOPODS — COOPER 25 



Museum, three brachial valve interiors, and one pedicle valve in- 

 terior. The outside and inside of these specimens are exactly like 

 those of the specimen illustrated on plate i, A, of this monograph 

 except in one instance. Examination of the pictures of the brachial 

 valve interiors under a magnifier failed to show any expansion of the 

 distal end of the median septum. A possible mixture of species has 

 occurred because the median septum of the largest of the three brachial 

 valves extends anterior to midvalve and nearly to the apex in the 

 opposite direction, is not abruptly elevated as typical, and seems to 

 have different crura. This appears to belong to some other genus 

 but it is difficult to say what it is. The other two are quite characteristic 

 of Cryptopora. The complete specimen is illustrated from the dorsal 

 side and shows the characteristic large foramen bordered by narrow 

 deltidial plates. I am unable to distinguish the details of the pedicle 

 valve interior from the picture. 



Davidson was a keen observer but it is difficult to escape the conclu- 

 sion that his figures of Mannia are a misrepresentation of specimens 

 of Cryptopora. I have therefore placed Mannia in the synonymy of 

 Cryptopora. 



BASILIOLIDAE Cooper, new family 



Basiliolinae Cooper, new subfamily 



Genus BASILIOLA Dall, 1908 



Plates 11, B, 12, 13, B, 14, A, C 



Basiliola Dall, Bull. Mus. Comp. Zool., Harvard Coll., vol. 43, No. 6, p. 442, 

 1908; Thomson, New Zealand Board Sci. Art, Manual 7, p. 154, 1927; Jack- 

 son and Stiasny, Siboga-Exped., Monogr. 27, p. 10, 1937. 



Basiola Thomson, Geol. Mag., n. s., dec. 6, vol. 2, p. 390, 1915 (Lapsus calami). 



Neohemithyris Yabe and Hatai, Proc. Imp. Acad. Japan, vol. 10, No. 9, p. 587, 

 1934; Hatai, Sci. Rep. Tohoku Imp. Univ., ser. 2 (Geology), vol. 20, p. 210, 

 1940. 



Outline elongated subpentagonal to rounded subpentagonal ; widest 

 at about midvalve; strongly inequivalve, the brachial valve being 

 greatly swollen but the pedicle valve gently convex ; anterior commis- 

 sure strongly uniplicate but the fold on the brachial valve low and in- 

 conspicuous ; surface smooth. Beak of pedicle valve small, nearly 

 straight, short ; foramen small, complete circular to elongate-elliptical, 

 submesothyrid ; deltidial plates small, conjunct, moderately to elabo- 

 rately auriculate. 



Pedicle valve interior with strong and complex pedicle collar ; teeth 

 small and corrugated, supported by short receding dental plates which 



