626 CRUSTACEA. 



ERICHTIIUS PALLIATDS. 



Carapax lotus, ad segmenti abdominis Btii medium producing postice 

 non latior, lateribus subito deflexus, dorso paululo convexus, fereplanus, 

 angulis anticis acutis, posticis longe productw ad usque segmentum 

 caudalem et acutis; margine inferiore integro, ad medium breviter 

 unirspinigero, postice acuto, margine postico inermi, recto, rostro tenui, 

 antennis internis paululo longiore. Abdomen Q-articulatum. Seg- 

 mentum abdominis posticum paulo transversum, posticd late truncatum, 

 emarginatum, spinulis pectinatum, angulis acute productum, lateribus 

 acutd bi-dentatum. Branchice parvulce. 



Carapax broad, reaching to middle of third abdominal segment, not 

 broader behind, sides bent downward ; back a little convex, nearly 

 flat ; anterior angles acute ; posterior angles produced, even as far 

 as caudal segment, acute ; lower margin entire, at middle a small 

 spine, and posteriorly acute; posterior margin unarmed, nearly 

 straight; beak slender, slightly longer than inner antennae. Abdo- 

 men with six segments ; last a little transverse, broad truncate 

 behind, emarginate at middle a,nd angles produced, slender acute, 

 sides with two teeth. Branchiae small. 



Plate 41, fig. 6 a, animal, enlarged ; b, dorsal view, natural size ; c, 

 buccal area and organs ; d, last joint of first pair of feet ; e, hand of 

 one of the short cheliferous legs. 



'8* 



Atlantic, latitude 6 south, longitude 24 west. Collected at 4 A. M. 

 November 8, 1838. 



Length, one and one-eighth of an inch ; breadth of carapax, one- 

 third of an inch. Colourless, excepting on the edges of some of the 

 segments and joints of some of the legs, which had a blue tinge. Per- 

 fectly transparent. 



The posterior margin of the carapax is without spine or tubercle, 

 and the surface anterior to the margin is unarmed. The ophthalmic 

 and two antennary segments are each distinctly separated by a suture, 

 and are situated beneath the general carapax. Abdomen broad, gra- 



