550 
ECHINODERMATA. 
p. 726, pi. lx. ; Porocidaris purpurata^ W. T., p.^ 728, pi. Ixi. & lix. figs. 
14 & 15 ; Phormosoma placenta^ W. T., p. 732, pis. Ixii. & Ixiii, figs. 1-8 ; 
Calveria hystrix^ W. T., p. 738, pis. Ixiv. & Ixv. ; fenestrata^ W. T., p. 741, 
pis. Ixiii. figs. 9 & 10, Ixvi. & Ixvii. ; Echinus flemingi, Ball., p. 744, 
pi. Ixviii. fig. 14; elegans^ D. K., ih. figs. 11-13 ; microstoma^ W. T., ih. 
figs. 1-10 ; Neolampas rostellata, Ag., p. 745, pi. Ixix. ; Pourtalesia Jef- 
frey si^ W. T., p. 747, pi. Ixx. figs. 1-10, & Ixxi. ; phyaU, W. T., p. 749, 
pi. Ixx. fig. 11. 
The following new deep sea genus and species are described by Lov5n 
... • 
Hemiaster expergitus, p. 13, pi. xiii. figs. 114-120 (970 faths., 38® T 
Lat. N., 9® 18' Long. W., Atlantic Ocean). 
Palceotropus (^Spatangidoe)^ for P. josephinoe^ p. 17, pi. xiii. figs. 108-113 
(Sea of Azores, 500 metres). Ovoid, convex; ambulacra not depressed, 
‘‘ k fleur de test,” entirely apetalous ; periproct posterior ; mouth 
bilabiate ; a sub-anal fasciole only ; 2 genital pores. 
Salenia goesiana, p. 27, pi. xix. figs. 159-165 (Sea of Antilles, 360 metres). 
The existence of a minute Pygaster (P. relictus) from the same locality 
is announced (p. 79). . 
Also a Cassidulus eugenice (p. 6) from the Galapagos. 
New diagnoses of Arachnoides placenta and zelandice (p. 34).. 
Asteridji. ' 
Monstrosities (through reproduction) of Asterias ruhens ; McIntosh, 
Invert. Si. Andr. pi. iv. figs. 1-3. 
On the differences and characters of Goniaster placenta^ M. Tr. {pla^ 
centiformiSj Heller) and G. acutus. Hell., on those of Asiropecten bispi- 
nosus, Otto, platy acanthus, Phil. ; and on the identity of Astropeoten 
spinulosus, Phil,, smdjohnstoni, D. Oh. ; Marenzeller (7). 
In the first portion Of a critical review of the genera and species of 
Starfishes, which is of special importance because it settles the many 
doubtful questions of difference or identity, arising chiefly from the 
imperfect descriptions of the late Dr. J. E. Gray, or from the uncritical 
use of the manuscript names of the Museum of Paris, and is based upon 
the study of types in the British Museum and of some in that of Copen- 
hagen, compared with the species in the “ Jardin des Plantes,” Perrier 
(10) acknowledges 7 families and 45 genera: 
A. P^dicellaires p4doncul^s, droits ou crois^s. Tubes ambulacraires 
ordinairement quadrisdrids. 
I. Asteriadce (^Asterias, Heliaster, Pycnopodia, Stichaster, Calva- 
sterias, g. n., Anasterias, g. n., Lahidiaster, Pedicellaster). 
B. P^dicellaires sessiles, en pince on valvulaires. Tubes ambulacraires 
ordinairement biseri^s. 
1. Squelette dorsal rdticul4. II. Echinasteridce (Acanthaster, 
Solaster, Bchinaster, Cribrella, Valvaster, g. n., Mithrodid). 
2. Bquelette dorsal form^ d’ossicules arrondis ou quadrangulaircs, 
