| OCR Text |
Show 1868.] DR. W. BAIRD ON THE GEPHYREA. 99 transverse rugoso-striatum, rotundato-inflatum, extremitate postica in mucronem obtusum desinente, antica paulo attenuata; pars exsertilis longa, cylindrica, rugoso-plicata; tentaculis 6 ? in pinnulas numerosas divisis. Long. corp. 6 lin., crass. 5 lin. ; long. part, exsert. 5 lin. Hab. 1 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 extremity 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. W e 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 In the other specimen the proboscis is almost entirely withdrawn, and the skin is much more distinctly wrinkled and striated.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 locality, I am led to believe them the same. Genera of Sipunculidse not sufficiently established, and the position of which is doubtful. Genus 1. ASCOSOMA. Ascosoma, Leuckart, Brev. Animal, quor. Descript. 1828 ; Quatrefages, /. c. ii. 1865. Ascosomum, Diesing, Syst. Helminth, ii. p. 75, 1851 ; Revis. d. Rhyngod. in I. c. 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. c. p. 778, 1859. Phascolosoma granulatum, Leuckart? Joh. Miill. 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. |
