648 
ZOOLOGICAL LITERATURE. 
all into a complicated raised system of network, with irregularly shaped cells, 
the ridges leaving more or less deep pits, giving, the test the appearance of 
having been gouged out in spots j ahactiual system resembles that of Cceno-- 
pedina ; but the anal system is covered by only four triangular plates, one 
larger than the rest. Whole test covered with pedicellarite, having a sharp- 
pointed head articulated on a long, slender thread. From 40 to 270 fathoms. 
Echinomelra michelini, Des. A. Agassiz, 1. c. p. 269, gives as synonyms E. 
lucimtery Liitk. (non Lam.), Heliocidaris mexicana, auct. (non Ag.), H. cas- 
telnaiidi, Hup^. 
SpatangoidecE. 
Spatangus i-aschi, Lov^n. Professor Lov^n exhibited specimens of this 
new species at the meeting of Scandinavian naturalists at Christiania, July 
1808. It was discovered by Prof. II. llasch on the deep-sea bank of Stor- 
ogzen, off the coast of Norway, in 1844, and since in the Zetland seas by 
Mr. Gwyn Jeffreys. It comes nearest to S. purpureus, O. F. M. In very 
young Spatangi the peristomium, situated nearer the middle of the body 
than in the adult, is exactly pentagonal j the mouth, forming an oval opening 
in its centre, is surrounded by perforated plates of an iri-egular form ; the 
mouth is soon drawn backwards ; and when it reaches the posterior side of 
the peristomial pentagon, this side begins to protrude forward and assume 
the vaulted lip peculiar to the Spatangidoe. Lov«5n, in Ann. &; Mag. N. Hist, 
ser. 4, vol. iv. Sept. 18G9, p. 220. 
Lissonotus fragilis, gen. et sp. nov., A. Agassiz, 1. c. p. 273. This genus 
has the general outline of Maretia, but is somewhat more elongate j it is also 
closely allied to Platyhrissus ; but the presence of a subanal fasciole, as well as 
a slight anterior groove, readily distinguish the two; the mouth is pen- 
tagonal, with a well-developed floscelle ; the plates of the two posterior am- 
bulacra are broad, while all the other ambulacra are made up of smaller 
plates; genital openings large, three, right anterior one obliterated; anal 
system transversely elliptical, its membrane covered by minute granulations ; 
anus opens in a short, delicate tube, similar to that of Neola?npas, but shorter. 
From 320 to 368 fathoms. 
Agassizia excentrica, sp. nov., A. Agassiz, L c. p. 276, from 30 to 115 
fathoms. 
Agassizia subrotunda, Gray. The locality given by Dr. Gray is Australia. 
Verrill, 1. c. p. 382, suggests that this may be erroneous, as two specimens 
were examined by him from La Paz, Gulf of California. 
Desoria * nodosa, sp. nov., Verrill, 1. c. p. 382, locality unknown. 
Echinocardium l<xvigaster, sp. nov., A. Agassiz, /. c. p. 277, from 79 to 
121 fathoms. 
Pourtalesia miranda, gen. et sp. nov., A. Agassiz, 1. e. p. 272. Body elon- 
gated, bottle-shaped ; test thin, transparent, neck being the posterior extre- 
mity ; at the base of the neck the test carries a deep pit, surmounted at its 
anterior extremity by a rostrum projecting from the test; and under this, at 
the bottom of the pit, is placed the anus. The lower surface is convex, 
regularly arched from the posterior to the anterior extremity. The posterior 
* This name, given to a genus of Thysanura by Agassiz in 1841, ought to 
be changed. 
