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Show 1868.] DR. W. BAIRD ON THE GEPHYREA. 103 1. PSEUDASPIDOSIPHON CLAVATUM. Sipunculus clavatus, Blainville, Diet. Se Nat. torn. xlix. art. Sipunculus, Atlas, t. 33. f. 2, 1828. Aspidosiphon clavatum, Diesing, Syst. Helminth, ii. p. 68, 1851. Aspidosiphon clavatus, Diesing, Revis. der Rhyng. Lev, 768 1859; ? Quatrefages, l.c. p. 611, 1865. Hab. Mediterranean (Blainville). Quatrefages says of this species that the figure given of it by Blainville in the work quoted above does not represent the anterior scutellum so characteristic of the genus, and which is found in all the other species described. The posterior extremity is conical and centrifugally radiated, but does not appear to have a regular scutellum. The same may be said of the next species, which is said by Diesing to belong doubtfully to the genus Aspidosiphon. I have therefore made a new genus for the reception of these two species, and for a third, which does not appear to have been previously described. 2. PSEUDASPIDOSIPHON SPRATTI. Sipunculus, sp., Spratt, Lond. Edin. & Dublin Philosoph. Magaz. xxxiii. p. 17L 1848. Aspidosiphon ? spratti, Diesing, Revis. der Rhyngod. I. c. p. 768, i oo y • Hab. Near the island of Malta, at 320 fathoms depth (Spratt). 3. PSEUDASPIDOSIPHON GRACILE, Sp. nOV. (Pl. X. figs. 1, la.) Corpus gracile, elongatum, cylindricum, striis circularibus cinclum, et granulis parvis, numerosis, brunneis obsitum, parte caudali conoidea, subito acuminata, centrifuge radiata, parte anteriore infra proboscidem attenuatam scutelliformi, brunnea, longitudinaliter rugoso-verrucosa; pars exsertilis attenuata, granulis minimis obsita ; proboscis retracta. Long, corporis 2\ une, crass. 1^ lin.; long, proboscid. \ une, crass. \ lin. Hab. Philippine Islands (Mr. Cuming). B.M. The body of this peculiar species is long and slender, circularly striated, the interspaces between the striae regularly beset with numerous small brown granules. Thecaudal portion terminates abruptly in a short conical point, which is longitudinally centrifugally striated, while the upper portion of the body just beneath the exsertile portion is of a dark brown colour, and longitudinally granulously striated, the two extremities resembling a good deal the scutella of the genus Aspidosiphon. The colour of the body is of a light yellowish hue, the two extremities (which show the resemblance to the scutella) being of a darker brown, resembling in this respect the Sipunculus clavatus, as represented by Blainville in his figure in the Atlas of the Diet, des Sc. Nat. Family III. LOXOSIPHONIDAE. Eusipunculidea, Aspidosiphones (part.), Diesing, Rev. Rhyng. 1859 . Loxosiphonea, Quatrefages, Hist. Nat. Ann. ii. p. 604, 1865. |