410 AV. C. M'raiOSH ON THE ANNELIDA 



liar tapering bristles. The ventral cirrus is large, but does not quite reach the tip of 

 the fleshy part of the foot. After the divisions of the feet become more distinctly 

 marked, one of the papillse in each becomes larger, that on the inferior lobe especially 

 showing cellular loculi ; posteriorly the papillee are not thus differentiated. The supe- 

 rior fascicle has many whorled bristles with large spines, as well as the more 

 finely serrated kinds. All the bristles of the inferior lobe have the canaliculated ter- 

 minal process, tapering to a fine point (PI. LXXIII. fig. 9). There is a semilunar pro- 

 cess on the superior border of the foot ; but no cilia are present. The branchial process 

 begins about the sixth or seventh segment, and soon increases in size, reaching the 

 tip of the foot about the twentieth segment. Certain whitish specks (parasitic?) appear 

 in many of the branchiae, and also in the skin of the ventral surface. The ventral cirrus 

 has a process like a diverticulum at its base anteriorly ; but such is not noticeable pos- 

 teriorly. The scales are perfectly smooth round the margin, minutely granular under 

 the microscope, and are tinged with light-brownish pigment. In small specimens curious 

 nucleated anastomosing nerve-fibres are very conspicuous. 



I doubtfully refer this form to the Leanira yhleni, Malmgren, who, unfortunately, 

 says nothing more than that the scales are smooth, and that there are four eyes — two 

 larger directed forward at the base of the antennae, and two smaller superiorly in the 

 middle of the head, the other parts resembling those of L. tetragona. 



PsAMMOLTCB HEEMINI^, Aud. & Ed.l' Dredged in 35 fathoms in Tangier Bay, and 

 more abundantly in Station 50, in 7-51 fathoms off the Algerine coast, on a bottom of 

 mud and muddy sand, in 1870. 



A large and boldly marked form, though all the specimens are incomplete. The 

 largest reaches 1\ inch in length, and is about -^ inch broad. The dorsum is barred ante- 

 riorly with brown or black bands from the scales, then assumes a uniform dai'k brown 

 or blackish brown, the scales especially being black with a lighter margin from the 

 cilia. The under surface is pale or mottled in front for a short distance, then blackish 

 or brownish. The bristles form a pale margin dorsally and ventrally. 



The head is entirely concealed by the first pair of scales ; and on their removal it is 

 still overlapped by two large fleshy processes bearing their surfaces of attachment, and 

 having a prominent papilla between them. The head, indeed, which extends behind these 

 fleshy processes, is small and somewhat ovoid, with the anterior part produced into the 

 enlarged base of the tentacle. A comparatively small eye is situated at the anterior 

 border a little exterior to the base of the tentacle on each side, and another, somewhat 

 larger, quite in the front of the head and below the former, so that it is scarcely visible 

 from the dorsum. The tentacle arises by a broad and somewhat lozenge-shaped base, 

 which gradually contracts into a prismatic process that reaches as far as the tip of the 

 peduncles of the tentacular cirri. At this point the rounded filiform tip commences ; 



' If this should prove to be a new form, the name P. carpenteri may appropriately be given to it. 



