492 PROCEEDINGS OF THE ACADEMY OF [July, 



127 to 248 fathoms, has uncini very like those of P. diomedce. Protula 

 antennata Ehlers, 1887, found off Cuba in 292 fathoms, does not belong 

 in the genus Protula. The uncini have the long terminal tooth, trun- 

 cated and notched. 



The Protis simplex Ehlers, 1887, has no operculum, but the collar 

 setae bring it into close relation to the genus Salmacina. The following 

 species from Bermuda also has some affinity to the genus Protis. 

 * From a mass of very much coiled and twisted eroded tubes partially 

 covered with sponges, ascidians, and bryozoans, an exceedingly 

 interesting deep crimson colored annelid with darker spots and mark- 

 ings was taken. The most perfect specimen is about 20 mm. long, 

 with between 60 and 70 segments, with 7 on the thorax, the fascicles 

 of setae in very oblique series. Branchial lobes wanting. Collai 

 apparently 4-lobed, reaching only to the 2d fascicle of setae; no later 

 or posterior free border on thorax. Collar setae with stout shaft or 

 manubrium with long, narrow, serrate, abruptly tapered end, bent and 

 somewhat enlarged at the base and coarsely serrate, spreading out, 

 resembling a fin. Other setae very long, very slender, with very 

 delicate deeply fringed blade with long lash-like end. Uncini small, 

 very numerous; on the abdomen the tori reaching nearly around the 

 body. They are somewhat triangular with few (5 or 6) curved pointed 

 teeth above an unusually large base, somewhat protruding beneath 

 the very large terminal tooth. Abdominal setae flaring, asymmetrical, 

 with serrate edge. The Filigrana Huxleyi Ehlers, 1887, from Tortugas, 

 in 19 fathoms belongs to this group. 



MEMBEANOPSIS sen. nov. 



Membranopsis inconspioua *p. nov. 



A small animal 6 mm. long is of special interest in the development 

 of the thoracic membrane. As the branchial lobes are wanting its 

 exact generic relation is indeterminable. The 9 thoracic segments 

 bring it in close relation to Salmacina, while the form of the uncini 

 and abdominal setae show affinity to Apomatus ; the development of 

 the thoracic membrane separates it from Salmacinopsis. 



It is of a brownish color in preservation, rounded, with but little 

 taper to the blunt posterior end. There are 9 thoracic and about 

 25 abdominal segments. The collar is of moderate depth, apparently 

 of four (4) lobes, two rolling rounded median ones and two small 

 lateral ones, which extend backward around the 3d fascicle of setae ; 

 from the 4th to the 8th fascicle, the free border is deeply incised on 

 the side of each forming separate deep narrow scollops; that of the 



