1370 CRUSTACEA. 



bilobato. Abdomen 2-articulatum segmento primo bilobato, postico 

 celato. Styli caudales lamellati, terminates. 



Body anteriorly but slightly broader than behind. Cephalothorax 

 three-jointed, second segment small, third with the dorsal shell very 

 much expanded backward and profoundly bilobate. Abdomen two- 

 jointed, but little narrower than the carapax. Anterior segment 

 bilobate, the posterior concealed. Caudal stylets lamellar, terminal. 



The great breadth of the abdomen, its deep bilobate character, and 

 the absence of any second or third abdominal segment in an upper 

 view, as well as the two elytra-like prolongations of the shell of the 

 third segment of the body, constitute the more striking peculiarities 

 of the Dinematurae. 



The frontal segment of the carapax is as in Caligus ; the anterior 

 and posterior antennae are also similar to those in that genus. The 

 mouth is a slender trunk, with the maxillae close appressed to it, as in 

 other Pandarinae. The first pair of feet is like those of the Caligi. 

 The second pair is cheliform, with a slender pointed ringer and a stout 

 prominence acting as an immoveable finger. The first and second 

 pairs of natatories are like those of Caligus. The third forms a large 

 plate, with small appendages to the margin corresponding to the two 

 branches. The fourth is smaller, and the appendages are much broader 

 and oblong, being thin lamellar, and edged with a few very short setae. 



The internal ovaries are convoluted in the large abdominal segment, 

 as usual, and the external are like those of other Caligidae. 



DlNEMATURA BRACCATA. 



Carapax fere rotundatus, dbdomine latior, discis suctoriis pone antennas 

 munitus ; postich quadrilobatus, lobis duobus internis angustis, curvatis, 

 subacutis. Segmentum secundum transversum, latere subacutum. iSeg- 

 menti aloe tertii vix oblongce, dirnidii abdominis longitudijie, posticd 

 parce latiores, angidis rotmidatis, margine p>ostico fere recto oblique 

 transverso. Segmentum abdominis primum profundi bilobatum, secun- 

 dum quadratum. Styli caudales grandes, subovati, abdominis extre- 

 mitatem paulo super antes, setis paucis brevissimis. 



Carapax nearly round, broader than the abdomen, furnished posterior 



