HOMOLAMPAS HASTATA. 



175 



HOMOLAMPAS A. Act. 



o 



Homolampas hastata A. Ag. 



Homolampaa haatata A. Ag., liull. M. C. Z. 1898, XXXII, No. 5, i>. 81, PI. XI, fig. 1. 



Plates 55, figs. ^^ 10 ; 63 ; 64, fig. 1. 



The specimens collected were nearly of tlie same size, about 30 mm. in 

 length, 22 in width, and 10.5 in height. This species is not as heart-shaped 

 as H. fulva,^ nor has it the pointed pos- 

 terior extremity of II. fragilis,^ Fig. 256, i. 

 It is marked by the great distinctness and 

 sharpness of its angular peripetalous fas- 

 ciole (PI. 63, figs, i, ,?) ; it is somewhat 

 irregularly pentagonal in outline and sur- 

 rounds the few primary tubercles found 

 near the apical extremity of the interam- 

 bulacral areas (PI. 63, fig. 1). On the 

 abactinal side of the anterior interambu- 

 lacra the primary tubercles with the ex- 

 ception of one or two are small, and are 

 arranged in irregular vertical rows along the 

 rounded ridges on both sides of the median 

 anterior ambulacral furrow. In the other 

 interambulacra the primaries are limited 

 to one large primary tubercle in each zone near the abactinal extremity of 

 the interambulacral areas within the peripetalous fascicle (PI. 63, fig. 1) 

 These primaries carry long Lovenia-like spines. The scrobicular areas of 

 the large tubercles are sunken, and they as well as the sunken areas uf the 

 smaller tubercles of the anterior lateral interambulacra form small rudi- 

 mentary processes projecting into the interior of the test, but by no means 

 so greatly developed as are the corresponding processes of Ilomohunpas fulru^ 

 or of II. fragilis^ 



Fio. 256. 



1 IToMOr.AMPAS FBAGILIS. 9,3 mm. 



2 '• FULVA. 95 mm. 



3 " UASTAT.V. 3-2 mm. 



1 " Challeni,'t'r " Echinoidea, PI. XXIV, figs. 2, 3. 



2 Revision of the Echini, PI. XVII, fiys. 1:5-15. 

 8 " Challenger " Echinoidea, i'l. XXIV, fig. 8. 



* Revi.sion of the Echini, PI. XVII, figs. 13-15. M. de Moijere describes a species of Homolampas 

 from the "Siboga" Expedition. From his sketches (PI. XXIII, figs. 489-491) it is not ix>ssible to 

 make out the genus to which his species belongs. The dorsal position of the anus, tho course of the 



