408 W. C. M'INTOSH ON THE AJfNELIDA 



SiGALiON MATHiLDiE, Aud. & Ed. A fragmentary specimen dredged in 7 to 51 fathoms 

 (No. 50) along the shore of the Algerine coast, between Capes Falcon and Tenez, in 

 1870. 



Leaniea hysteicis, Ehlers '. Simultaneously with the diagnosis of this and certain 

 other Annelids of the ' Porcupine ' Expedition, published by Dr. Ehlers in the ' Annals 

 and Magazine of Natural History ' for April 1874, I had mentioned the same form 

 (pp. 2G8, 269) under the title of L. Icevis ; Dr. Ehlers's name, however, may with pro- 

 priety be adopted. My examples were dredged in 808 fathoms off the south-west coast 

 of Ireland (Station 2) in 1869, on a bottom of soft thick mud. The same station is 

 amongst those mentioned by Dr. Ehlers. 



It is a comparatively small species, none measuring more than an inch in length. 



The head is slightly dusky from the presence of pigment along the anterior border. 

 The tentacle is remarkably short and small, being shaped like the handle of an awl — 

 narrow at the base, dilated in the middle, and tapering to a blunt point at the tip. The 

 palpi spring close' together on each side inferiorly, and have throughout a perfectly 

 smooth investment ; they are long and tapering ; each has at its base, towards the inner 

 side and ventral surface, the usual scoop-shaped lamella. Immediately above the palpus 

 on each side is a peduncle bearing three processes, viz. : — superiorly a tentacular cirrus 

 about a fifth the length of the palpus ; inferiorly a minute organ of the same nature, 

 extending only a short way beyond the peduncle ; and an awl-handle-shaped minute 

 process attached to the base of the peduncle superiorly. The latter is similar in form 

 to the median tentacle, near which it is placed. Inferiorly the oral aperture has pro- 

 minent rugose lips, with a blunt papilla on each side of the median fissure in front. 

 No eyes are visible in the spirit-preparations ; and none showed traces of the bristles 

 usually present in allied forms on the peduncle of the tentacular cirri. Only a single 

 scale remained attached to a specimen. It is rounded, translucent, and perfectly smooth 

 in outline and surface. 



The first foot is directed forward, its dorsal di\'ision being represented by a supe- 

 rior rounded papilla, which bears about a dozen digit-like processes and a series of fine 

 hair-like bristles (PI. LXXIII. fig. 6), minutely or in others more distinctly and spirally 

 spinous. The inferior lobe has characteristic spirally marked bristles with tapering 

 extremities (PI. LXXIII. fig. 7, one of the superior forms), those near the spine being 

 stoutest, while of the others the superior, as usual, are stronger than the inferior. The 

 distal margin of the shaft of these bristles has blunt projections or spines analogous to 

 those in Phyllodoce and others. The inferior lobe has also a papilla superiorly and 



' Ann. Nat. Hist. ser. 4, vol. xiii. p. 292, April 1874. The specimens examined by Dr. Ehlers were in all 

 probability those given by Dr. Carpenter and Prof. WyvUle Thomaon to the lamented Prof. B. Claparede, aud 

 procured in 1869 at a greater depth than 500 fathoms. 



