BIOLOGY. (II, B, i, C—h.) 
Echin. 41 
e. OPHIUROIDEA. 
1. General:—Elementary account of anatomy; Shipley & 
MacBride (280) pp. 248-253. 
2. Vacant. 
3. Homology :—Mouth-parts of Oph. and Ast. not homologous, 
see under 5 ; Zur Strassen (338). 
I Vacant. 
5. Skeletal system:—Mouth-parts; Hamann (146) p. 897: 
derived from brachial elements, Ludwig’s view modified, chiefly 
from evidence of Amphiura squamata , Astrophiura , Ophioglypha , 
in so far as parts are formed not from 1st and 2nd segments, 
but from 2nd and 3rd, and peristomalia are independent for¬ 
mation ; therefore Oph. mouth-parts not strictly homologous 
with those of Ast .; Zur Strassen (338). 
6-11. Vacant. 
12. Gonads :—Structure of spermatozoa; Hamann (146) p. 897. 
f. GRINOIDEA. 
1. General:—Elementary account of anatomy, based on Antedon ; 
Shipley & MacBride (280) pp. 269-273. 
2, 3, If. Vacant. 
5. Skeleton :—Detailed account of anat. of Uintacr. socialis , 
especially arm-length (p. 15), syzygies (p. 18), absence of 
covering-plates (p. 20), pinnules (p. 20), base with or without 
IBB, with discussion as to centrale and general principles of 
composition of base (p. 22), tegmen of exocyclic structure 
(p. 38), showing anal tube (p. 40), excentric mouth and open 
subvective grooves (p. 42); Springer (290). 
Tegmen of fossil and recent Flexibilia and Inadunata dis¬ 
cussed in relation to Uintacr ., esp. that of Actinometra ; 
Springer (290) p. 43. — Coiled anal tube in Scaphiocr. ; 
Rowley in Greene (141) p. 61. 
Arms develop from uniserial to biserial, nothing new; 
Grabau (134). 
6. Hydrocoel &c.:—vide sub n, b, i, a, 3 ; Russo (269). 
7. Vacant. 
8. Digestive System :—Exocylic nature of Uintacr. see5. 
9-11. Vacant. 
12. Generative System :—vide sub n, b, i, a, 3; Russo (269). 
g. CYST IDE A. 
1- lf. Vacant. 
5. Skeleton :—Thecal plates and subvective grooves of Agela- 
crinidae , variations and systematic value; Clarke (69) pp. 
188-192.—Skeletal anatomy of the Carpoidea , a new Class 
\_ = Anomalocystida sens, lat.]; Jaekel (162). 
6. Hydrocoel &c.:—Madreporite not detected “in any agela- 
crinite”; Clarke (69) p. 189. 
7. Vacant. 
8. Digestive System:—Position of mouth and anus in Carpoidea , 
relations of foodgrooves; Jaekel (162) p. 663. 
9-11. Vacant. 
12. Generative System :—Gonopore, vide sub n, b, i, a, 3; Russo 
(269).— Plated swellings attached to stem of Rkipidocystis, 
supposed to contain gonads; Jaekel (162) p. 665. 
h. BLASTOIDEA. 
1. General account: with reference to figures, for museum 
purposes; Bather (16). 
2- 12, Vacant. 
