BY E. F. Hallman^. 675 



the genus Hi(iginsia\ but tlie latter, in wliich the niicroscleres 

 are spined microstroiigyla, evidently requires a new genus for 

 its reception, and for this I pi'opose the name AUantella. 



The new genera proposed in this Paper, in addition to those 

 already indicated in this Postscript, are J^habdosignia{Y>.b20), 

 Echiitaxia{p.Di3}, Stronyylamma{p.^i?>), and Parati'mea{p.%l b). 



Genus Halicneimia Bowerbank. 



Dejinition. — Axinellid{e(?) typically of encrusting habit, some- 

 times disc-shaped, with a main skeleton consisting of smooth 

 skeletal tylostyli disposed (in part, at least) vertically, with their 

 heads based upon tlie substratum, and with dermal megascleres 

 in the form of smooth, typically centrotylote tornota. The 

 microscleres are centrangulate, spined microxea similar to those 

 of the genus I/igginsia. 



Type-species, //. pate' a Bowerbank(l). 



Topsent(49) would include in this genus, in addition to //. 

 patera, Bowerbank's Hymeraphia verticilhita, and the species 

 originally described by him as Buharis constellata,— hoth of 

 which agree with //. patera in the possession of skeletal tylostyli 

 and centrotylote, diactinal dermal megascleres. The very de- 

 cided differences between these three species in certain other 

 respects, however, appear to me to render necessary the alloca- 

 tion of each to a separate genus. 



In Hymeraphia verticillafa, the acanthoxea are of slightly 

 curved form and verticillately spined, and the smooth, diactinal 

 megascleres are tritid at both extremities; and, furthermoie, the 

 species is sometimes of massive habit. To replace the (pre 

 occupied) generic names Laothoe and Ncsnia ah'eady proposed by 

 Gray(ll) for this species, I propose the name Laonteiiia. 



The third species referred to has euasters for microscleres, 

 and, but for its possession of special dermal megascleres, would 

 probably require to be referred to the genus 7'iniea. For its re- 

 ception, I propose the new genus I'araiimea, which I would 

 include in the family Spirastrellidae. 



