154 SCOLECOLEPIS. 



larvae with about sixteen to seventeen segments. Cunningham, 1 again, describes the 

 segmental organ, which has a tubular inner funnel, and a long duct which opens 

 externally. 



Mesnil gives, in his review of the literature of the species, credit to Claparede as 

 having a correct knowledge of its characters, for Delle Chiaje had given an almost 

 unrecognisable figure. He thinks the Neapolitan examples are larger than those at 

 Wimereux, but that the dorsal lamella accompanying the branchia is not terminated by a 

 rounded lobe. He expresses surprise that Claparede did not notice the winged hooks in 

 the dorsal lobe, and does not mention the greenish hue of the body. The Malacocerus 

 longirostris of De Quatrefages is the same annelid. He shows reasons for identifying 

 Verrill's Nerine agilis with the present form, and so with the Nerine heteropoda of 

 Webster. His account of the bristles of various examples is minute. 



In 1898 Michel described a bud on a posterior fragment; but a more elaborate study 

 of the process of regeneration of the various parts of this form was carried out by 

 Nusbaum 2 (1905) at Naples, along with that of Amphiglene mediterranean. Sections were 

 cut from the living forms, and careful examinations made of the proliferating parts at 

 various intervals. He gives a longitudinal section of the reproduced tail. The broadly 

 spear-shaped tip is smooth. 



Genus XCVII. — Sooleoolepis, De Blainville, 1828. 



This genus was established by De Blainville 3 in 1828 for Rathke's 4 Lumbricus 

 squamatus. Forgotten by authors, it was resuscitated by Malmgren, and later by 

 Mesnil. 6 Snout (prostomium) with frontal horns. Branchia3 from the first setigerous 

 segment to the last. Anus surrounded by cirri. Always two rows of bristles in each 

 division of the foot. In a certain number of the ventral divisions the posterior row 

 includes winged hooks. 



The forms under this head have been variously named, for instead of the genus 

 Spio of 0. Fabricius, as revised by (Ersted, Schmarda constituted a new genus, Colo- 

 branchus, whilst De Quatrefages made two, viz. Malacoceros and Uncinia. Claparede, 

 again, ranged the species under the old genus Spio. 



The body- wall in Scolecolepis vulgaris (Fig. 1 15) is constructed anteriorly on a similar 

 plan to that of Nerine vulgaris. The central ganglia of the nervous system lie outside the 

 muscles of the dorsum, and the cords rapidly pass downward to the inner end of the widely 

 separated ventral longitudinal muscles, and then to the middle line, each to meet its 

 fellow. As soon as the oral aperture is completed by the frilled hypoderm, an irregular 

 circular coat is apparent, the most conspicuous part being a broad belt, which bounds 

 the mouth posteriorly and ventrally, and stretches to the great muscular masses at 



1 c Quart. Journ. Micr. Sci.,' vol. xxviii, N.s,, p. 247, pi. xviii, figs. 7—8. 



2 ' Zeitschr. f . wiss. Zool./ Bd. Ixxix, p. 222, Taf . xiii— xvi, and Text-figs. 



3 ( Diet. sc. nat./ Vers, t. lvii, p. 492. 



4 f Zool. Danica/ iv, p. 39, pi. 155, fig. 1—5. 



5 ' Bull. sc. Fr. Belg./ 4 e ser., t. xxxi, p. 245. 



