400 BULLETIN OF THE 



of the uncini such tufts or brushes as are described in connection with the 

 radula of P. Adansoniana. 



The tooth formula would be written, R (^ + | ) + ( -£A- + 45? ), the 

 middle tooth (R) and the right half of the radula being included in the 

 formula. 



Section ENTEMNOTROCHUS Fischer. 

 Pleurotomaria (Entemnotrochus) Adansoniana Crosse & Fischer. 



Plate XXX. Plate XXXI. Figs. 3, 4, 5, 6. Plate XXXII. Fig. lO. 

 Plate XXXVII. Fig. 4. 



Pleurotomaria Adansoniana Crosse & Fischer, Journ. de Conchyl., IX. p. 1C3, pi. V. 

 figs. 1, 2, 1801. Dall, Bull. M. C. Z ., IX. p. 78, 1881. Crosse, Journ. de 

 Conchyl , XXII. p. 12, pi. i. figs. 1, 2, 1882. Dall, in Agassiz, Three Cruises 

 of the Blake, II. p. 69, fig. 288, 1888. 



Habitat. Station 278, in 69 fins., coral bottom, temperature 68°. 0, dead; 

 Station 276, in 94 fms., temperature 61°. ; Station 291, in 200 fms., stones, 

 temperature 49°.75 F.; all near Barbados. Guadelupe, in 150 fms., Fischer. 



The specimen from Station 291 is now (with the broken one. from Station 

 278) in the Museum at Cambridge. It will be referred to as "specimen a." 

 The other, now in the U. S. National Museum, will be called "specimen 6." 

 Their respective measurements are as follows. Max. diam. of base, 130.0 and 

 88.0; min. diam., 111.0 and 79.0; max. alt. of shell, 130.0 and 70.0; max. 

 lat. of aperture, 60.0 and 41.5; max. alt. of aperture, 38.0 and 26.0; Ion. of 

 slit, 200.0 and 142.0 mm., in both cases a little more than half the length of 

 the last whorl, which in specimen b measured, in all, 237.0 mm. Its operculum 

 measured 35.0 mm. in greatest diameter. 



The width of the slit is from 2.5 to 3.5 mm. in specimen a, which has eleven 

 whorls. It is from 2.5 to 2.75 mm. in specimen b, which has ten whorls. The 

 specimen from Station 278 was of a much more brilliant yellow than the two 

 others, and the painting was somewhat different in each specimen from either 

 of the others. -The nucleus was uniformly filled with solid matter. 



The soft parts in this species were a little better preserved than in P. Quoy- 

 ana, since, in specimen b, the mantle to the anal commissure was intact, and 

 the branchia upon it, as well as the anal termination of the intestine and the 

 glands below it. The crop or stomach, and everything behind it, however, no 

 longer remained. In specimen a only the body and head remained. 



The external parts in life, as represented by the draughtsman, were reddish, 

 finely tuberculated or punctate with yellow, thus reproducing the colors of the 

 shell. In the preserved specimen the soft parts showed no markings, and 

 appeared of a livid waxen hue, common to specimens preserved in spirits. 



In a general way, the superficial characters resemble those of P. Quoyana, 

 but there are some differences. 



May 12, 1889. 



