1911.] NATURAL SCIENCES OF PHILADELPHIA. 285 



fascicle of anterior segments have the wings abruptly terminated and 

 the shaft continued as a very long acute mucron. They differ con- 

 siderably in length and proportions in the same bundle and posteriorly 

 all become much elongated and slender. Anterior crochets (figs. 

 106, 106a) are transitional to the acute limbate setae, having long, 

 slender limbate ends passing into delicate rounded hoods which 

 enclose the small, indistinctly toothed heads. Though gradually 

 diminishing in length, they undergo no conspicuous change through the 

 branchial region, but posteriorly become converted into true crochets 

 (fig. 107) which are alimbate, somewhat stouter and have shorter, 

 thicker ends and more inflated hoods enclosing a well-developed 

 beaked and crested head. 



Mandibles (PI. XIX, fig. 108) delicate, flexible and nearly white, ex- 

 cept that the tips of the masticatory plates and a pair of submedian 

 lines are black. Carriers or stems long and slender, separated for about 

 the posterior two-thirds of their length, firmly united anteriorly and 

 widened into a broad plate bearing the narrow, strongly curved con- 

 tinuous masticatory plate which terminates in a strongly but irregu- 

 larly toothed apex. Maxilla? (PI. XIX, fig. 109) deep brown, opake, 

 the forceps jaws with long bases or carriers nearly equal to the jaws in 

 length, together having the outline of an urn, but not united medially; 

 hinges well-developed and the jaws very strongly and regularly curved. 

 The large dental plates (II) are massive, symmetrical and each provided 

 with a series of eight regular stout teeth on the inner margin. Max- 

 illa? Ill small, narrowly ovate with one large hooked tooth succeeded 

 by a slightly curved, serrate margin. Anterior maxillae (IV) large, 

 with similarly serrate, medial margin, but the large tooth less well- 

 developed. A pair of long, narrow, brown, chitinized bands lie at 

 the sides of the large dental plates. 



Integuments unpigmented, but cuticle with a beautiful pearly 

 luster. 



Known from three specimens, one each from stations 4,450 (type), 

 off Point Pinos Lighthouse, Monterey Bay, 55-60 fathoms, dark green 

 mud ; 4,485, off Santa Cruz Lighthouse, Monterey Bay, 39-108 fathoms, 

 soft green mud and sand; 4,523, off Point Pinos Lighthouse, 75-108 

 fathoms, soft dark mud. 



Ninoe fusoa sp. nov. PI. XIX, figs. 110-118. 



This species, described from a single incomplete specimen, has the 

 general Lumbrineris build, but is stouter and more depressed than 

 most species of the genus. The type, consisting of two pieces together 



