LINOPNEUSTES MURRAYI. 223 



the West Indian species longispinus is really congeneric with them. But having 

 thus expressed my skepticism, it seems best to let matters stand as they are 

 for the present. 



Key to the Species of Linopneustes. 



Peripetalous fasciole well above ambitus and near tips of petals; poriferous areas of each 

 petal nearly parallel or diverging distally. 



Apical system .40-.46 of test-length from anterior end murrayi. 



Apical system about .30 of test-length from anterior end excentricus. 



Peripetalous fasciole truly marginal, far from tips of petals; poriferous areas converging 

 distally longispinus. 



Linopneustes murrayi. 



Palaeopneustes murrayi A. Agassiz, 1879. Proc. Amer. Acad., 14, p. 210. 

 Linopneustes murrayi A. Agassiz, 1881. Challenger Ech., p. 168. 



The pedicellariae are very abundant in this species and the characteristic 

 forms were figured by Mr. Agassiz on plate 43 of the Challenger Report; 

 the rostrate (fig. 6) are notable for the slender valves, .80-90 mm. long; the 

 slender tridentate (fig. 7) have valves .50-1.30 mm. long; and the stout triden- 

 tate (fig. 8) have valves .30-.60 mm. long with broad, somewhat flattened 

 blades. Globiferous, ophicephalous, and triphyllous pedicellariae seem to be 

 wanting. There are, however, minute tridentate with valves less than .20 mm. 

 in length. The various forms of tridentate pedicellariae intergrade and show 

 very great diversity in width of blade and in the proportion of the blade in 

 contact with its fellows. 



Comparison of the specimens collected by the Albatross, a series ranging 

 from 24 to 84 mm. in length, with cotypes of the Challenger species, convinces 

 me that they should be referred to murrayi, although the apical system may be 

 only .40 of the test-length from the anterior end. On account of this tend°ncy 

 towards an anteriorly excentric apical system, these Albatross specimens were 

 in the preliminary report referred by Mr. Agassiz and myself to excentricus. 



Station 4906. Southwest of Koshika Islands, Japan. Bott. temp. 43.4°- 

 42.6°. 369-406 fms. Gy. glob. oz. 



Station 4907. Southwest of Koshika Islands, Japan. Bott. temp. 42.6°. 

 406 fms. Gy. glob. oz. 



Station 4909. Southwest of Koshika Islands, Japan. Bott. temp. 42.9°. 

 434 fms. Gy. glob. oz. 



Station 4911. Southwest of Koshika Islands, Japan. Bott. temp. 41.9°. 

 391 fms. Gy. glob. oz. 



