18C8.] DR.W. BAIRD ON THE GEPHYREA. 93 



to the Noitli-Americnn Boundary Survey under Col. Hawkins. It 

 may possibly be only a variety of the preceding species. 



14. Phascolosoma planispinosum, sp. uov. 



Corpus sncclforme, albo-grisetan , (/ramilis brunneis miniitls ohleclitm, 

 granulis ad extremitatem posticam in spinis latis mutatis ; pars 

 exsertilis partem tertiam corporis aquans, spinis latis, majoribus, 

 brunneis obtecta ; tentaculis retractis. 



Long. Corp. G lin., part, assert. 4 lin. ; corp. crass, usque ad 3g 

 lin. 



Ilab. 1 {Mr. Caminc/'s Collection). B.M. 



The body of this species is of a light greyish colour, deeper at the 

 two extremities, where the minute granules with which the body is 

 covered are replaced by flat sharp-pointed spines, standing out nearly 

 erect from the skin. The exsertile portion is particularly marked in 

 this manner, the spines being numerous and larger than at the pos- 

 terior extremity. The shape of the body is very similar to that of 

 Sipunculus (Phascolosoma) c/emtensis of Blainville, but differs in 

 being very much smaller and having the exsertile portion, compa- 

 rati\ ely speaking, longer, and being very rough with the flat spines. 

 Unfortunately we have only one specimen, which was collected by 

 the late Mr. Cuming, but no habitat was attached to it. 



1.5. Phascolosoma multitouquatum. 



Sipunculus {Phymosor/ium) multitorquatus, Quatrefages, J. c. ii. 

 p. 621, I8G5. 



Hab. Guettary {Quatrefages). 



IG. Phascolosoma spinicauda. 



Sinunculus {P/njmosonuim) spinicamla, Quatrefages, I. c. ii. p. G21, 

 18G5. 



Hah. Barcelona {Q •itrefac/es). 



17. Phascolosoma guttatum. 



Sipmiculus {Phymosomum) ffuttains, Quatrefages, I. c. ii. p. 021, 

 1865. 



Hab. Red Sea {Quatrefaffes). 



18. Phascolosoma orbiniense, 



Sipunculus {Pkymoso)num) orbime7isis, Quatrefag^es, I.e. ii, p.G22, 

 186.-). 



Hab. American seas {M. tTOrbiymj). 



19. Phascolosoma plicatum. 



Sipunculus {PItymosomum) plia 

 JGf). 

 Hab, ? Indian seas {Quatrefages). 



Sipunculus {PItymosomum) plicatus, Quatrefages, /. c. ii. p. 622, 

 186;"). 



