176 EUSPIO MESNILL 



Strethill Wright, 1 again, minutely described the tentacles of a S±no seticomis without 

 indicating what form he meant. Malmgren does not account for this species. The form 

 which Cunningham and Ramage 2 call Spio seticomis is mentioned without size, and the 

 distribution of the branchiaB is peculiar, whilst the tip of the tail resembles that of 

 Pygospio. Mesnil thinks it has the characters of Pygospio elegans of Claparede. Levinsen 

 calls a form Spio seticomis, Fabr., because it has winged hooks on the 8th setigerous 

 segment, but he gives no diagnosis of the species. 



The Spio seticomis of Dalyell 3 (1853) has certain resemblances to a Poly dor a, but its 

 position is uncertain. 



The Spio seticomis of Benham 4 (1896) may refer to Pygospio elegans as well as to the 

 original form. 



Mesnil (1897) considers that Spio seticomis, CBrsted, is a Pygospio, the difference 

 between it and Pygospio elegans being the presence of branchias in S. seticomis on the 

 second segment, and the larger size of the latter species in which the number of segments is 

 sixty. The colour is pale, only a little bluish-green pigment exists on the anterior 

 segments, whilst the prostomial lobe is attenuated and long, and is bifid without the 

 intercalation of a median lobe, and lastly slight differences occur in the tips of the 

 hooks. 



Genus XCIX. — Euspio, n.g. 



Snout with a bluntly bifid median rostrum and a bulging process of the peristomium 

 on each side. Eyes, two or three pairs on each side of the median ridge. Body as in 

 Spio, but terminating in two dorsal and two ventral subulate cirri, the dorsal being 

 thicker. Branchige from the first foot to the posterior end. Bristles as in Spio. 



The Spio Isevicomis of H. Rathke 5 probably belongs to this series, though he figures 

 the frontal tentacles as somewhat longer. 



] . Eusrio Mesnili 6 (= Spio filicornis, Malmgren). Plate XCVIII, fig. 6— tail; Plate XCVI, 

 figs. 7-7d — feet; Plate CV, figs. 11-11/; — bristles and hook, and fig. 16 — 25th foot. 



Specific characters. — Snout somewhat like that of Polydora on a large scale and akin 

 to that of Pygospio, with a bluntly-bifid median rostrum and a bulging process of the 

 buccal segment on each side. Eyes minute, two or three, on each side of the median 

 ridge posteriorly. The median process passes backward from the tip of the snout and 

 ends in a conical papilla. Body 2 — 3 inches in length, broad in front, and with scarcely 



1 < Edinb. New Philos. Journ./ Oct., 1857, p. 191. 



2 l Trans. Eoy. Soc. Edinb./ vol. xxxiii, p. 640, PI. xxxvii, fig. 4. 



3 c Pow. Creat./ vol. ii, p. 159, PI. xx, fig. 22. 



4 < Camb. Nat. Hist./ vol. ii, p. 322. 



5 < Beitr. Faun, der Krym./ p. 421, Tab. VIII, figs. 1—6. 



6 This agrees with Malmgren ; s Spio filicornis, but not with that of Fabricius. The specific name 

 is in honour of Prof. Mesnil. 



