82 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
Schizaster Townsendi A. Ag. 
A large series of this species was collected during our cruise from a number 
of localities. It is marked by the flatness of the test and the great width of 
all the lateral ambulacra, the small size of the anal system, the close primary 
tuberculation of the actinal plastron, which is in striking contrast to the bare 
actinal surface. 
Station No. 3394. Gulf of Panama. 511 fathoms. 
“cc “ 3419. “ “ “cc “ 
oe aa ee “ 674. « 
(74 ce 3425. “ “ 680 “ 
“ “ 3426. “ “ 146 “cc 
(74 cc 3431. “ce ee 995 if4 
“cc “ 3436. “ “ce 905 “ 
a “3437. 50 miles south of Guaymas. 628 “ 
Periaster tenuis A. Ac. 
Plate XI. Figs. 6, 7- 
This species is much flatter and less globular than the species from the Gulf 
of Mexico (P. limicola). It has no anal fasciole; the peripetalous fasciole is 
wide, with prominent miliaries; the actinal plastron is elongated, and the 
tuberculation of the test close. In life the color of the test is light brown. 
Station No. 3381. Off Galera Point. 1772 fathoms. 
Fe a oogs. + ds ‘Se 1673 ~ 
“ “e 3399. {it “cc “ee 1743 “ 
Brissopsis columbaris A. Ace. 
The Pacific Brissopsis is readily distinguished from the Atlantic species by 
the great length of the lateral ambulacra, the flatness of the test, and the great 
width of the area enclosed by the subanal fasciole. The anal extremity of the 
test is also more sloping than in the European species, and characterized by 
the great size of the anal system. The great variation found in specimens of 
the genus both on the Atlantic and Pacific sides of the Isthmus of Panama 
leads me to think that there has been some confusion in referring to Brissopsis 
such elongate types of Spatangoids as I figure on Plate XX VI. Figure 7 of the 
Blake Echini.t I shall refer to this again in my final Report on the Albatross 
Echini. 
Station No, 3353. 695 fathoms. 
a *« 3356. Off Mariato Point. 546 “ 
se “ 3382. Off Mala Point. 1798) 9 
is * 3394. Panama Bay. BY oe 
1 Mem. Mus. Comp. Zodl., Vol. X., No. 1, 1883. 
