Gttttij Mitrine Labonifori/j St. Andreics. 1 ."> 



centre of tlic ri(l;;cs, which pass in front from the ba^es of 

 tlie sctigerous papillaj to the edge of the ventral scutes, and 

 behind these almost to the mid-ventral line. \\"\t\\ the 

 cessation of tlie bristles a change ensues, for the hooks are 

 now borne on a {jromiiient hnnella — sli;;htly cresccntic or 

 scoop-shaped, — and phieed lalcrally at the |)Ostciior edye of 

 each segment, which still consists of two rings. These 

 lamellie diminish in size posteriorly, becoming minute to- 

 ward the tip of the tail, and on them the lu^oks form 

 a close series in a single row. The hooks are distinguished 

 by their elongated basal rigion, wliieli has a median con- 

 vexity, then curves upward at the anterior edge, which has 

 a small process for the ligament. A process occurs on the 

 anterior margin about its middle, a double curve meeting at 

 this point. The large fang is well developed, and has only 

 a single tooth above it in a lateral view. The posterior 

 margin has a deep incurvation. The hooks vary chiefly iu 

 the sh.ipe of the basal region. 



The next and eighth form, Lanice conchilega, Pallas, is 

 everywhere distributed on tlie sandy shores of JJrit lin. 



The cephalic region is distinguished by its comparatively 

 small dorsal collar, the rim, however, expanding at each 

 side into a great lateral flap which iu some almost meets its 

 fellow of the op[)osite side in the mid-ventral line behind 

 the lower lip, its outline in this region forraing a V. In 

 others, the union of the lateral regions is more complete 

 ventrally, some fusing so as to form a continuous band with 

 only a slight concavity in front, thus i)rc)bablv indicating 

 the normal condition as a comi)]ete ventral web, the median 

 gap being due to accidents. A marked charactcrisiic is the 

 disposition of the anterior margin of the tentacular surface, 

 for it is contracted into a frilled spout-like border sur- 

 rounding the mouth — except in violent protrusion. Witliiii 

 the aperture are two folds, an outer smaller and an inner 

 larger tongue-like fold. Cunningham and Kamage consider 

 the large lower lip an I the absence of eyes characteristic of 

 Lattice as contrasted with Terehella. 



The tentacles have the usual grooved structure, and form 

 a dense mass of mobile organs. In the centre of the living 

 tentacle under pressure a pale band (.f muscular fibres \)yo- 

 cceds from the base to the tip. The other parts of the wall 

 appear to consist of an inextricable series of innscular tibics 

 -—longitudinal, tr.msverse or circular, and oblique. In the 

 interior of the tentacles are numerous cells, but whether 

 tree or adherent is not evi !cnt, though they do not separuie 



