SQUILLOIDEA. 627 



dually widening to the last segment, about one-third as long as broad, 

 excepting last, which is a little shorter than its breadth. This caudal 

 segment corresponds to two normal segments, and a suture near its 

 base marks the separation. 



Eyes large, obconical. The inner antennae have a three-jointed 

 base bearing three branches, one of which branches arises from the 

 basal portion of the shortest and stoutest branch. This short branch 

 is not as long as the common base ; it is furnished with hairs on one 

 side ; the other branches are a little longer than the base, but do not 

 extend beyond the apex of the beak. First joint of base longer than 

 the other two. Second antennae three-jointed; the last an oval ciliate 

 plate. Branch very slender, appended to basal joint; consists of two 

 joints and a multiarticulate extremity. Mouth small. Epistome 

 subtriangular with strongly arcuate sides. Maxillipeds consist of a 

 basal joint bearing three joints ; the first of which is broad, and but 

 little longer than the breadth, the last quite narrow, and all setose on 

 the inner margin. Mandible coarsely dentate. 



First pair of legs slender ; second joint longest, about equal to last 

 three ; last shortest and ending in a short claw. Sjecond pair with 

 the third joint longer than second. Finger long, nearly straight, ex- 

 tending nearly to base of hand, inner margin entire. Hand of next 

 three pairs rhombic. Lamellae at base of these and the two pairs 

 preceding nearly circular, largest on anterior pair, and smallest on the 

 posterior. No appendage to fourth thoracic segment. Those to fifth, 

 sixth, and seventh segments very slender and imperfect, and attached 

 to the segments on their sides or quite laterally. 



Abdominal legs five pairs. Both lamellae two-jointed. A minute 

 lobed appendage, branchial in character, near inner base of outer 

 lamella, and a short slender appendage to inner base of second joint 

 of interior lamella. 



This species is near the E, Guerinii of Eydoux and Souleyet (Voy. 

 de la Bonite, pi. 5, fig. 32). 



ERICHTHUS VESTITUS. 



E. palliato affinis, carapace segmentoque caudali similis. Carapca- 

 usque ad segmentum abdominis jjenultimum productus, postice non 

 latins, angulis posticis longs' acuteque producing, margine postico recto, 

 ad medium spind parva acuto, margine in/eriore medium inermi, an- 



