OCR Text |
Show 102 DR. W. BAIRD ON THE GEPHYREA. [Feb. 13, 6. ASPIDOSIPHON LAEVE. Aspidosiphon Iceve, Quatrefages, /. c. p. 609, t. 20. f. 23, 24. Hab. Indian seas? (Quatrefages). 7. ASPIDOSIPHON CUMINGII, sp. nov. (Pl. XI. fig. 2.) Corpus cylindricum, fuscum, antice densissime, postice paululum verrucosum, in medio rugosum et circulariter striatum; scutellum anterius subellipticum, brunneum, longitudinaliter sulcatum, posterius centrifuge sulcatum, sulcis dichotomis ; proboscis brevis, cylindrica, gracilis, rugosa, fasciata. Long. corp. 3 une, lat. 7 lin.; long, probose 8 lin. Hab. Philippine Islands (Cuming). B.M. This is the largest species I have seen. Anteriorly it is densely granularly tuberculated for nearly an inch in length, posteriorly for only a very short distance. In the middle the body is circularly striated and longitudinally ribbed, as it were, with pellucid ribs. It is of a brownish colour, much deeper at the two extremities, and marked with scattered granulations. The anterior scutellum is of a somewhat oval or elliptic shape, broadly sulcated longitudinally, near the proboscis tubercularly granulated, and at a short distance from where it terminates on the body it is keeled. The posterior scutellum is circular, is marked by the same kind of sulci as the anterior, but radiately disposed and dichotomously divided towards the external margin. It is separated from the lower part of the body by a sharp keel which surrounds it. The proboscis is rugose, slender, and short, is of a light colour at its two extremities, and peculiarly marked in the middle with a broad band of a deep brown. 8. ASPIDOSIPHON TRUNCATUM. Phascolosoma truncatum, Keferstein, Nach. kon. Gesell. Gottingen, 1866. Phascolosoma (Aspidosiphon) truncatum, Keferstein, Zeitsch. f. wissensch. Zool. Band xvii. p. 50, t. 6. f. 15-18, 1867. Hab. Panama (Agassiz fide Keferstein). 9. ASPIDOSIPHON RADIATUM. Phascolosoma radiata, Alder, Ann. & Mag. Nat. Hist. 3rd ser. v. p. 75, t. 5. f. 4-6, 1860. Sipunculus (Cryptosomum) radiatus, Quatrefages, I. c. ii. p. 629, 1865. Hab. Shetland Isles, in shells of Aporrhais (Barlee fide Alder). Genus 2. PSEUDASPIDOSIPHON, Baird. Corpus gracile, duabus opacitatibvs, scutella simulantibus, instructum. Extremitas posterior conica, centrifuge radiata; extremitas anterior, scutello destituta, opaca. Cetera ut in Aspidosiphone. |