2 Richard Hagg. 



dages. Their length is 8 millims. On the front part of the 

 upper side of the head, there are 3 triangularly placed processes. 

 The two anterior of these which are situated close to the front 

 margin of the head are tubular in the same way as the rhino- 

 phores, open at the ends, and supplied with thready appendages of 

 the same shape as those. The posterior of these three processes 

 is fixed to the middle of the head. It is laminate, lobed and 

 supplied with numerous thread-like appendages. Besides there 

 are on the head a few lesser laminate processes and a great 

 many thready processes. On the edges of the head, there are 

 some solitary leaf-shaped processes with thread-like appendages. 

 On the anterior part of the foot processes are wanting. Not 

 very far behind the anterior right tentacle, is situated the ope- 

 ning of the genital furrow. — The middle part of the body is 

 covered with small unbranched thready processes, as well as with 

 large leaf-like processes supplied with thread-like appendages. 

 The former are situated very close to the margin of the foot. 

 They are also rather numerous round the exterior border of the 

 branchial cavity. They are least numerous on the front part 

 of the body. 



The aperture of the branchial cavity is situated at the same 

 distance from the front as from the hind end of the animal, a 

 little more to the right than to the left. It is open. Its length 

 is 26,5 millims, its breadth is 19 millims. Its length consequently 

 is a fourth or a fifth of the length of the whole body. The 

 front edge of the branchial orifice is somewhat recurved. The 

 large pectinal gill is largely situated outside the aperture of the 

 branchial cavity. The length of the gill is 41 millims. It is 

 placed transversally and is, for the most part, free. The anal 

 canal opens behind the gill in the hindmost part of the branchial 

 orifice, on the right side at the point of the excurrent siphon. 

 The anus is surrounded on the internal side by 9 annularly 

 arranged papillae. Of these four are larger and all of the same 

 size. Between each of these four a smaller papilla is situated, 

 not however between the two higher ones. For between these 

 there are two small papillse. 



On the left, a little anteriorly to the gill, lies the opaline 

 gland. On the right, close to the external border of the bran- 



