1868.] DR. W. BAIRD ON THE GEPHYREA. 99 



/ 



transverse rugoso-striatum, rotundato-inflatum, extremitate postica 

 in mucronem obtusum clesinente, antica paulo attenuata ; pars 

 exsertilis longa, cyli/idrica, rugoso-plicata ; tentaculis 6 ? in 

 pinnulas ?iumerosas divisis. 

 Long. corp. 6 lin., crass. 5 lin. ; long. part, exsert. 5 lin. 

 Hub. ? Australia (Earl of Derby's Coll). B.M. 



This species, which is one of many specimens of natural history 

 collected for the late Earl of Derby by the late John Macgillivray, 

 appears different from all the others in our collection. When the 

 exsertile portion is protruded, it is completely bottle-shaped, and the 

 skin is entirely free from granulations. It is, however, wrinkled, 

 transversely finely striated and rugose, and at the posterior ex- 

 tremity is almost clathrate. This portion of the body is rounded, 

 inflated, and terminates in a blunt conical point. The exsertile 

 portion is of considerable length, is cylindrical in shape, and rugosely 

 plicate. The tentacles or cirri are short and much pinnated. 



We possess two specimens of this species — one with the exsertile 

 portion and tentacula protruded, from which the diagnosis is chiefly 

 drawn up, and which apparently, when collected, had been allowed 

 to dry, and has thus, to outward appearance, become almost 

 smooth ; when examined, however, more carefully, the skin is seen 

 to be wrinkled and transversely striated. In the other specimen 

 the proboscis is almost entirely withdrawn, and the skin is much 

 more distinctly wrinkled and striated. At first sight they appear 

 to be distinct species ; but as they come from the same locahty, I 

 am led to believe them the same. 



Genera o/" Sipunculidae not sufficiently established, and the position 



of which is doubtful. 



Genus 1. Ascosoma. 



Ascosoma, Leuckart, Brev. Animal, quor. Descript. 1828; Qua- 

 trefages, I. c. ii. 18(.i5. 



Ascosomum, Diesing, Syst. Helminth, ii. p. 75, 1851 ; Revis. d. 

 Rhyngod. in I.e. p. 778, 1859. 



Ascosoma blumenbachii. 



Ascosoma blumenbachii, Leuckart, Brev. Animal, quor. Descrip. 

 p. 21, t. 1. f. 4, 1828 ; Quatrefages, I. c. ii. p. 630, 1865. 



Ascosomum blumenbachii, Diesing, Syst. Helminth, ii. p. 76, 

 1851 ; Revis. d. Rhyngod. in I.e. p. 778, 1859. 



Phascolosoma granulatum, Leuckart? Joh. Midi. Wiegm. Arch. 

 p. 168, 1844. 



Hab. Mediterranean, near Cette (Leuckart). 



Genus 2. Anoplosomatum. 



Anoplosomatum, Grube, Act. Echin. Wiirm. Adriat. p. 47, 1840 

 (charact. emend.) ; Diesing, Syst. Helm. ii. p. 68, 1851 ; Revis. d. 



