450 
ECHINODERMATA. 
hooka j arai-spines denticulate at the extremities, in dense series before the 
ambulacral pores j dental and oral papillae and teeth similar, spine-shaped j 
two genital slits in each interambulacral area, alongside the arms ” : Lyman, 
1. c. 
A few new species from the Ked Sea Ophiura, sp.”, O. hrachyura”) 
are alluded to, but not described, by Gray (10, p. 117). 
Lyman’s opinions regarding nomenclature (c/. Zool. Rec. viii. p. 460) are 
criticized by the Recorder (Am. Journ. iii. 1872). Cf. also Agassiz (2), 
pp. 11-13. 
Crinoidas. 
Wyville Thomson (21) records 4 free Crinoids, viz. Antedon eschrichtiy 
in the channel between Faerd and Scotland, sarsi^ rosacms —mediterraneus), 
and celticus, and 3 stalked species — Rhizoctinus lofotensis, now found in many 
deep-sea localities, a new Pentacrimts, and the t}'^pe of the equally new genus 
Rathycrimis, as found in the area explored by the British deep-sea expe- 
ditions. 
Pentacrinus. The dilferences between P. asteria and muelleri are cleared 
up. In the former the 2nd and 3rd radialia are united by sutures as in the 
latter j syzygia sometimes occur in intervals along the arms of the latter ; and 
in some specimens of the former a syzygium may be met with here and there. 
(P. decQi'iis is abandoned. The author’s statement that the number of arms 
never exceeds 30 in muelleri is incorrect, one of the specimens in Copenhagen 
having 34, another 44 arms, as pointed out by the Recorder). There are no 
distinct oral plates in P. astei'ia (as stated by Michelin). Interesting ob- 
servations are made on the disengagement of the crown and superior part of 
the stem j and in P. muelleri this separation is held to be habitual at a certain 
stage. This is also the case in P. wymllethomsonif Jeffir., a species (lat. 39° 
42' N., long. 9° 43' W., 1095 fath.) intermediate, in some of its characters, 
between P. asteria and muelleri. Id. 1. c. p. 767. 
BathycrinuSf g. n., id. 1. c. p. 772 (Apiocrinince). Stem long and delicate, 
joints dice-box-shaped, us in Rhizocriuus, diminishing in length towards the 
head, where calcareous laminm are added beneath the coalesced joints, 
which form the base of the rays. Five first radials, closely apposed, but not 
fused together as in Rhizocrinus j the centre of each rises into a sharp keel, 
while the sides are slightly depressed towards the suture, giving the calyx a 
fluted appearance. Second radials long and free from one another, joining 
the radial axillaries by a straight syzygial union j a strong plate-like keel runs 
down the centre of the outer surface j and the joint is deeply excavated on 
either side, rising again slightly towards the edges. The radial axillary 
shows a continuation of the same keel through its lower half j and midway 
up the joint the keel bifurcates, leaving a diamond-shaped space in the 
centre towards the top of the joint. Arms 10, perfectly single, of few (12) 
joints, without pinnulae j first brachial united to the second by a syzygial 
joint, but after that the syzygia are not repeated. B. gracilis^ 200 miles 
south of Cape Clear, 2435 fath. 
Lacaze-Duthiers, Arch. Z. exp6r. 1, pp. x-xii, notes a locality for studying 
Antedon rosaccus and its juvenile state. 
