416 PROCEED fNGS OE THE NATIONAL MUSEUM. vol. xxvm. 



Stephanoaeris it should be '' Psammoseris.^ Psamrnxoseris bears the 

 same relation to the Ktipsaniinid o'emis Jleteropsarmnla as Sfephano- 

 .serls to the Turbiiiolid <;(muis Iltff r<>cy(if/iiii<. In this genus, also, onh' 

 false synapticula are present, and it, also, must fall." 



Von MarenzcUer considers that two of Milne-Edwards and Haimc's 

 species belong- to JltterocydtJiio^^ namely, //. aequlcostatu,^ and II. [Sfej^/i- 

 anoseris] roussaearnis. Verrill added one species of JTeterocyathus^"' 

 11. alternatu.-i ; and von Marenzeller places the three species of Stejjh- 

 anoHeris., iS. lameUosa^'' S. jaixniiat,'' and 6'. .sulc<(f((^'' in the same 

 genus. Other species of TIeteroeyatJins have been described, but they 

 need not be noticed here. 



From an examination of the literature, 1 am inclined to believe that 

 Tenison-Woods, Moseley, and von Marenzeller are correct in consider- 

 ing the type species of Steph<iii<>f<ei'ls a Hetcrocyatlnia.^ but unfortu- 

 natel}' the studies on the relations of these genera are based onh" on 

 literature; before certainty can be obtained the type species must be 

 studied. 



Professor Verrill says, concerning Stephanoserlx; Jranellom., "Wall 

 rudimentary, represented near the margin only by trabicular pro- 

 cesses." As Professor Verrill descril)ed one species of ITetei-ocynthiis., 

 and differentiated his species of ^* Stcphivnomrlii'''' from that genus, I 

 am inclined to believe that none of the species referred by him to the 

 latter genus belong to the former. 1 strongly suspect that von IVIaren- 

 zeller's lleterooyathnx japontcuK. (Verrill) is incorrectly identitied. 

 What final disposition nmst be made of the Verrill species must bo 

 left to future work.' 



«Prof. Essex Inst., IV, 186o, p. 149; also, V, 1866, p. 41, j)!. ii, figs. 6, 6a. 



''Idem, IV, p. 149; V, p. 46, pi. ii, figs. 4, 4a. 



c Idem, V, p. 47. 



<l Idem, V, p. 48. 



<" Since this manuscript was sent to press I have been able to study in the Yale 

 University Museum the types of Professor Verrill's species of Stephanoseris. I made 

 the following notes: 



Slephanoseris japonica Verrill. Type, No. 767, Yale Univ. Mus. Wall perforate, 

 distinctly costate, costte alternating in size. Septa perforate, with typical Pjipsam- 

 mid arrangement. 



Stephano^cris sulcata Verrill. Type, No. 764, Yale Univ. Mus. Wall perforate, dis- 

 tinctly costate, costa' alternating in size. Septa perforate, with typical Eupsammid 

 arrangement. 



Slephanoseris lamellosa Verrill. Tyjie, No. 766, Yale Univ. Mus. Wall perforate, 

 distinctly costate, costye alternating in size. Septa perforate, with typical Eupsammid 

 arrangement. 



The genus, to which these species belong, is not closely related to Heleronjalhus. 

 They are Eupsammids, very (dose to Balanophi/llia, from which they are separated 

 by their apparent commensalism with a Sipunculid worm. Every specimen is 

 attached to a small gastropod shell, and has a small wormhole in its base. The 

 genus is se[)arated fi-om Heleropsammia by its well-developed costae. Most probably 

 Verrill's Slephanoseris is not the Slejihanoseris of Milne Edwards and Haime, it may 

 be an undescribed genus. 



