ONUPHIDIDAE. 2G3 



middle and posterior regions there is a largely black aciculiforni seta, the crochet, 

 running obliquely and projecting at the base of the neurocirrus. It is narrowed 

 and curved at the tip, where it ends in a low, usually blunt tooth, below which 

 is a much larger one. (Plate 57, fig. 4). 



Jaws rather heavy, hard, and black. Maxillae I with carriers firmly 

 united into a rounded, laterally bulging, suborbicular plate; the blade just 

 above base on ectal side with a projecting angle or tooth, above which it is of the 

 ordinary falcate form; the blades have but little free motion, being closely 

 united proximally and clasped by large reflex processes from the second maxillae. 

 Maxillae II heavy; teeth six, stout, or seven, including a small, imperfectly 

 separated, proximal one. Both plates alike, the teeth largest distad, preceded 

 proximad by a long smooth edge. (Plate 57, fig. 1). MaxiUae III of left side 

 with one plate bearing four small teeth, the other seven; plate of right side longer 

 and bearing nine teeth. 



Locality. Galapagos Islands : near Hood Island, Ripple Point. Sta. 4642 

 (lat. 1°, 30' 5" S., long. 89° 35' W.). Depth 300 fms. Bottom temp. 48.6 F. 

 Bottom of broken shells and Globigerina. 7 November, 1904. One female 

 turgid with eggs. 



In having pectinate gills over the entire length of the body this species is 

 like the following reported from the Pacific Ocean: L. antennata (Savigny), L. 

 microprion (Marenzeller), L. flavofasciata, (Giube) L. bilobata (Treadwell), and L. 

 iHultipectinata (Moore). From L. muUipectinata, known from off the southern 

 CaHfornian coast, the species differs, among other points, in having the dorsal 

 setae strongly winged instead of being wingless, in having the blade of the 

 compound setae differently formed, the maximum number of gill-filaments 

 larger, the tentacles not distinctly annulate, the anal cirri but a single pair and 

 these strongly tapered. From L. bilobata, an Hawaiian Island form, the species 

 differs in having the paired tentacles relatively decidedly shorter, in the different 

 structure of the compound setae, etc. The present species in general structure 

 seems to approach L. microprion rather closely; but it differs, for example, in 

 having the branchiae begin on IX instead of on VI and in having a much larger 

 maximum number of gill-filaments (seventeen or nineteen instead of but eight) 

 and in the larger number of teeth on the paired plates of maxillae III. 



Onxjphididae. 



As in the Leodicidae, to which the present family is very close and with 

 which, consequently, it is often united, the body is elongate and vermiform, 



