GPUBEA CLAVATA. 235 



Grubea clavata, Claparede, 1864. Plate LXXXVII, fig. 10— foot; Plate LXXXVI, 



fig. 11 — bristle. 



Specific Characters. — Head with three fusiform tentacles, four eyes arranged in a 

 trapezoid and with lenses, a pair of palpi soldered at the base, and two pairs of tentacular 

 cirri, similar in shape to, but longer and larger than the tentacles. Body slightly tapered 

 in front and more so posteriorly, 2—4 mm. in length and of thirty-four bristled segments. 

 Proboscis with a single tooth shaped like the tip of a lance ; proventriculus with twenty- 

 two rows of points, and the stomach with two lateral cseca. Tail with two fusiform cirri 1 

 longer than the ordinary forms. Foot presenting a fusiform dorsal cirrus, a somewhat 

 conical setigerous process with two short clavate papillae clistally, and a short ventral 

 cirrus. Bristles translucent, terminal pieces of moderate length with minutely bifid tips. 

 Ova (eighty to one hundred) borne on the dorsum by a pedicle of the capsule. 



Synonyms. 



1863. Syllis clavata, Claparede. Beobacht., p. 41, pi. xii, figs. 28 and 29. 



1864. Sphserosyllis clavata, idem. Glanures Zoot., p. 90. 



1865. Grubea fvsifera, De Quatrefages. Arm el., ii, p. 35, pi. vii, figs. 16 — 21. 

 1865. ,, clavata, idem. Ibid., ii, p. 40. 



1868. „ „ Claparede. Annel. Nap., p. 207. 



1874. ,, dolichopoda, Marenzeller. Sitzb. K. Akad. der Wiss. Wien, p. 26, pi. iv, fig. 1. 



1879. ,, clavata, Langerlians. Zeitsclir. f. wiss. ZooL, Bd. xxxii, p. 564, Taf. xxxii, fig. 21. 



1881. „ „ idem. Nova Acta Leop. -Carol. Deutsch. Akad., Bd. xlii, p. 105. 



1886. „ „ De St. Joseph. Ann. Sc. Nat,, 7 e ser., t, i, p. 200, pi. x, figs. 75, 76. 



1908. „ „ Elwes. Journ. M. B. A., n.s., vol. viii, p. 197. 



Habitat: — A single example from a laminarian root at a low spring-tide at Oddicombe 

 Beach, Torquay (Major E. V. Elwes). 



Mediterranean (Claparede) ; Atlantic, Channel (De Quatrefages, De St. Joseph). 



The head is furnished with four eyes, the two anterior being wider apart and with 

 lenses, a median and two lateral tentacles, fusiform at the base and with a tapered tip, 

 and a pair of palpi, which are coalescent and ciliated. The buccal segment bears a pair 

 of tentacular cirri on each side larger and longer than the tentacles, but of similar shape. 



The body is almost o — 4 mm. in length, and has thirty-four bristled segments. It is 

 a little tapered at either end, the greater part being of nearly equal breadth. Posteriorly 

 it diminishes to the tail, which has two caudal cirri of similar fusiform shape to, but longer 

 than the dorsal cirri. The proboscis occupies the first five segments, and has a single 

 tooth shaped like the tip of a lance. The proventriculus has twenty-two rows of " points 

 gris," followed by the stomach with two small lateral ca?ca. The colourless dorsal vessel 

 passes to the left of the proboscis and forms a ring as in PasdojjhyJax verruger of Claparede 

 (De St. Joseph). 



The foot (Plate LXXXVII, fig. 10) has dorsally the fusiform cirrus with a rather 

 long tip, a conical setigerous region with two clavate papillge distally, and bearing a series 



1 Langerlians states that there are four short anal cirri. 



