NATURAL SCIENCES OF PHILADELPHIA. 357 



PgAMMECHINUS INTERMEDIUS Bam. MS. 



Coronal plates high ; tubercles of interambulacral area of uniform size, 

 arranged in ten vertical rows ; in ambulacral space in four. Two vertical 

 rows of small tubercles in poriferous zone. The third outside vertical row 

 of pores very irregular, forming small arcs of two to three pairs of pores. Spines 

 short and stout ; ovarian openings large. Outline somewhat depressed ; mouth 

 opening small. 



" Hakodadi Bay." 



" Ousima." ("W. Stimpson.) 



PSAMMECHINUS PULCHERRIMl'S Bam. MS. 



The tubercles are quite small, closely packed together, of uniform size, ar- 

 ranged in slightly bent horizontal rows, four to eight in each interambulacral 

 plate, according to the position ; large miliaries fill up the intermediate space 

 between the horizontal rows. In the ambulacra there are three small tu- 

 bercles on each plate, making thus horizontal rows of sixteen tubercles in 

 the interambulacra and six in the ambulacra. The spines are very minute, 

 slender and sharp. The test is thick ; pores are arranged in oblique lines of 

 four, and the rows are separated by small tubercles. Notches round the mouth 

 very marked and deep for this genus. 



" Color light olive, greenish above, brownish below. Found among stones 

 and Laminarise in \ f. Hakodadi Bay." (W. Stimpson.) 



Toxopneustes drobachiensis Ag., Cat. Rais. 



"Very common in 10 fathoms, gravel and muddy gravel. Seniavine 

 Straits, W. shore of Behring's Straits." (W. Stimpson.) 



"Very common in 2 f. mud, off shingle beaches in Avatscha Bay, Kamtschat- 

 ka." (W. Stimpson.) 



See my remarks about the geographical distribution of this species in 

 Proc. Bost. Soc. N. H., vol. ix., p. 191. 



Toxopnecstes carnosus Barn. MS. 



This species is closely allied to T. drobachiensis, from which it is easily dis- 

 tinguished by the flesh color of its test and pink color of its spines. The 

 pairs of pores are placed very close together, so that each arc is narrow, 

 containing from 5 to 6 pairs. Two principal rows of tubercles with miliaries 

 not numerous, but prominent, arranged in a circle round the primary tubercle. 

 The spines are short and slender ; the notches of the actinostome scarcely 

 perceptible. 



Dredged in Behring's Straits. Capt. Rodgers. Gulf of Penginsk, Ochotsck 

 Sea; Capt. Stevens. 



Loxechinus purpuratus A. Ag., Boll. Mus. Comp. Zool., 1863. 



" Taken among rocks at 1. w. m. near San Francisco, Cal., (Sir Francis 

 Drake's Bay;) occasionally brought to market." (W. Stimpson.) 



Sphaerechinds brevispinosus Des. Syn., Echin. Foss. 



" Taken by the natives by diving, in 2 f. rocks. Funchal Bay, Madeira." 

 (W. Stimpson.) 



" A young specimen, probably. In 20 f. among nullipores. Porto Praya, 

 Cape de Verdes Ids." (W. Stimpson.) 



MlCROCYPHUS ELEGANS A. Ag. 



Remarkable for the great number of small tubercles scattered irregularly 

 round the two principal vertical rows of interambulacral tubercles. Depres- 

 sions at junctions of plates, with a tendency of running into one another, 

 both in the ambulacral and interambulacral spaces. The space free from 

 spines quite small, hardly more marked than in Goniocidaris in the interam- 

 bulacral region ; comparatively broad in the ambulacral region. 



"In 25 f., coarse gravel and nullipores off" the headland of Hakodadi, Isl- 

 and, Jesso, Japan." (W. Stimpson.) 



1863.] 



