PENEROPLIDINAE 323 



Sub-family PENEROPLIDINAE 

 Genus Cornuspira, Schultze, 1854 



46. Cornuspira involvens, Reuss. 



OpcrcuUna involvens, Reuss, 1849-50, FOT, p. 370, pi. i (xlvi), fig. 20 (not 30). 

 Cornuspira involvens, Brady, 1884, FC, p. 200, pi. xi, figs. 1-3. 



Eight stations: 51, 53, 388; WS 71, 88, 93, 217, 221. 



Rare except at WS 88. With the exception of one specimen at WS 88, the whole of 

 the individuals are megalospheric. They are all of a small neat type and there is a 

 great range of size in the megalosphere. 



47. Cornuspira polygyra, Reuss (Plate VII, fig. 5). 



Cornuspira polygyra, Reuss, 1863, KTF, p. 39, pi. i, fig. i. 



Cornuspira polygyra, Reuss, i87o,FSP,p.463,and Schlicht, 1870, FSP,p.9i,pI.xxxv, figs. 1-4. 



Two stations: 388; WS88. 



The specimens are small, ranging up to 0-20 mm. only in diameter, but agree with 

 Reuss's figure and description. They are all megalospheric and some run up to as many 

 as twelve or thirteen convolutions. One or two specimens show a tendency to a slight 

 increase in the diameter of the final convolution, as described by Reuss in his original 

 diagnosis of the species. 



48. Cornuspira selseyensis, Heron- Allen and Earland. 



Cornuspira (.'), Earland, 1905, FBS, p. 199, pi. xiii, figs. 2-4. 



Cornuspira selseyensis, Heron-Allen and Earland, 1908, etc., SB, 1909, p. 319, pi. xv, figs. 9-1 1. 



Cornuspira selseyensis, Cushman, 1918, etc., FAO, 1929, p. 82, pi. xx, fig. 9. 



One station: 53. 



At this station a few small individuals were found, rather more regularly coiled than is 

 usually the case. 



49. Cornuspira denticulata, sp.n. (Plate VII, figs. 6-8). 

 Three stations: WS 87, 88, 225. 



Test discoidal, nearly flat, somewhat depressed at centre, peripheral edge rounded, 

 wall very thin, consisting of a large proloculum followed by 4-6 embracing convolutions 

 of a round tube slowly increasing in diameter. Where the inner edge of the tube overlaps 

 the previous whorl, the shell substance extends over that whorl in minute denticulations. 

 Aperture, an arched opening, over which the outer edge of the tube usually projects 

 forward. Surface smooth and glistening, but showing lines of growth in the form of very 

 faint striae. Colour white to pale straw, translucent. Diameter ranging up to 0-25 mm. 



Only a few specimens, all in a good state of preservation, were found at each station, 

 the best being at WS 88 and 225. They were at first regarded with some hesitation, as 

 the denticulate markings and translucent wall were more suggestive of Spirillino than of 

 Cornuspira. In fact the specimens bear some resemblance in their markings to the form 



