HOLOTHURID^, E6HINTDil5. 547 
Thyone suspecta, p. 92, pi. vi. fig. 19 (Barbados) ; mirahilis (subg. 
Stolus), p. 93, pi. vi. jfig. 18 (Bowen). 
Thyonidium schmeltzi^ p. 94, pi. vi. fig. 20 (Bowen, Gulf St. Vincent) ; 
occidentale, p. 119 (Surinam). 
Orcula tenera, p. 95, pi. vi. fig. 21 (Upolu, Samoa). 
Phyllophorus frauenfeldi, pi. vi. fig. 22 (Red Sea) ; holothurioides^ p. 96, 
pi. vi. fig. 23 (hab. V). 
Stichopus errans, p. 97 (Barbados) ; fuscus, ib. (Patagonia). 
Muelleria excellens, p. 98, pi. vii. fig. 32 (Samoa). 
Lahidodemas duhiosum, ib. pi. vii. fig. 25 (Tahiti). 
Holothuria signata, p. 99, pi. vii. fig. 36 (Tahiti) ; pertinax, p. 100, 
pi. vii. fig. 50 (Samoa) ; kuharii, ib. pi. vii.' fig. 48 (Pelew) ; mexicana, 
p. 101, pi. vii. fig. 47 (Mexico) ; sulcata, id. pi. vii. fig. 46 (West Indies) ; 
notabiUs, p. 102, pi. vii. fig. 43, and Uneata, p. 103, pi. vii. fig. 42 
(Bowen) ; ccesarea, ib. pi. vii. fig. 39 (Samoa) ; occidentalism p. 104, pi. vii. 
fig. 35 (West Indies) ; cuhana, ib. pi. vii. fig. 34 (Cuba) ; dietrichi, p. 105, 
pi. vii. fig. 31 (Bowen, Hong Kong); peregrinam ib. pi. vii. fig. 30 (Bowen, 
Samoa) ; insignis, p. 106, pi. vii. fig. 28 (Bowen) ; modesta, ib. pi. vii. 
fig. 26 (Cape York) ; clemens, p. 107, pi. vii. fig. 49 (Samoa) ; captiva, 
p. 108, pi. vii. fig. 45 (Barbados) ; depressa, ib. pi. vii. fig. 44 (Tahiti^ 
Pelew, Philippines); imitanSm p. 109, pi. vii. fig. 41, samoana, ib. pi. vii. 
fig. 38, and rugosa, p. 110, pi. vii. fig. 33 (Samoa) ; curiosa, ib. pi. vii. 
fig. 29, and bowenlen']sis, p. Ill, pi. vii. fig. 37 (Bowen) ; surinamensis, 
ib. pi. vii. fig. 27 (Surinam) ; impatiens, Forsk., var., p. 112, pi. vii. fig. 51 
(Tahiti) ; vagabunda, Sel., var., ib. pi. vii. fig. 40 (Samoa, Bowen). 
EcHiNIDiE. 
McIntosh (5) has examined the structure of the spines of Diadema 
mexicanum and setosum, Centrostephanus rodgersi, Echinothrix calamaris 
and turcarum, Astropyga radiata, and Asthenosoma varium. An analysis 
of the genera and species of this family, according to the differences 
afforded by the structure of the spines, is given, p. 554. It is sug- 
gested, from the structure of the spines, that Garelia ought to be re- 
stored as a genus, and D. antillarum as a Species. The same author gives 
abridged notes on the spines of Echinometra, Stomopneustes, Parasalenia, 
Strongylocentrus and Hipponoe, in Q. J. Micr. Sci. xv. pp. 103, 202, 331, 
410, 413, & 415. 
The chief results of Perrier’s (9) researches maybe given thus: — 
Exclusive of the oesophagus, the intestinal tube consists of two distinct 
regions : the first performs the digestion and the absorption of the 
nutritive matter through the vessels ; the other is respiratory, filled with 
sea water, through the “ intestinal siphon,” and renews the liquor of 
the body-cavity. The circulatory system is composed of an absorbent 
portion (the internal and external marginal vessel of the intestine, the 
“ collateral vessel,” and the capillary net of the first segment of the in- 
testine), and a respiratory portion (the “sand canal,” the ambulacral 
vessels terminating “ en cul-de-sac,” and the ambulacral tubes (feet or 
tentacles) with their vesicles (the internal gills). These two divisions of 
