470 Miscellaneous. 



Pedicels of feet surrounded with flattened strap-shaped spicules, 

 generally arcuate, sometimes slightlj- dilated in breadth in the 

 middle, or at this part throwing out a lobe ; the spicule is jjer- 

 f orated with a few foramina, which, except in the case where the 

 spicule is dilated centrally, are usually arranged in single file. 

 Terminal plate not observed in this specimen. 



Tentacle-spicules : the larger very like in general character to 

 those of the pedicels, but often a little expanded at the extremities 

 and bearing in that part three or more foramina ; other spicules are 

 cribriform, often elongate, more generally very irregular in form ; 

 the smallest of tliese, which clothe the extremities of the ramifica- 

 tions of the tentacle, are very delicate in their structure. 



Specimen B. — Body-spicule like that of A, but only a spicule here 

 and there showing any nodulous growth, the vast majority presenting 

 a perfectly smooth surface ; nor are they so universally confined to 

 the number of four foramina, the spicules often having an addi- 

 tional foramen at each end (?'. e. four in a direct central longitudinal 

 line) ; among them were also very many in an early stage of 

 growth, spectacle-formed, two foramina being united by the central 

 bar. No bell-shaped spicules have been found in this specimen, 

 though they have been thoroughly sought for. Pedicels with 

 lateral spicules, some just as in A, but here more generally with 

 about three small foramina at each end ; termination of pedicel with 

 an arborescent delicate cribriform plate in the centre, and at the 

 edges several much stouter cribriform plates of irregular outline (it 

 is possible that these disunited plates ultimately coalesce into one 

 cap). Tentacle-spicules as in A. 



Specimen C. — Young, only 14 millim. long. Body-spicule exactly 

 as in B, but here I could not find a single one that was nodulous, 

 and no bell-shaped spicules. Pedicel-spicules as in B. Tentacle- 

 Bpicules : the smaller of these, having to clothe very minute termi- 

 nating branches of the tentacle, are much smaller than in A, and the 

 ramifications greatly reduced in size, so that under a usual power of 

 microsco])e for examination they look like little round or nodulous 

 bodies, and it requires the use of a considerable power {?- inch and 

 high ej epiece) to reveal their structure. 



Specimen A corresponds very closely with Herouard's figures of the 

 spicules of his '^Semjjeria Drummondii" the only slight difference 

 being that the spicules he draws have attained a yet higher degree of 

 calcification, especially shown in figs. 3 and 7, where the foramina 

 are much more contracted in size than in my specimens. 



Specimen B corresponds closely with Th. Barrois's figures of his 

 Cvcumaria Lefevrii, \fiih. this curious exception — in his figs. 4 and 5 

 additional foramina are shown which are built on to the side, so 

 that the number of lateral foramina is increased. In mine a large 

 number of spicules are enlarged beyond the usual four openings, but 

 it is in almost every case in the central line, one at each end, and no 

 tendenej'^ whatever is shown to increase laterally. 



My specimens were procured for me iu 1865 at Polperro by the 



