162 



AJUMIirOPA NORMALIA. 



apex; palm very oblique, slightly convex, not dchju-d; carpus short, 

 not longer than the breadth of the propodqg, interiorly produced. 

 First two pairs of pereiopoda smaller than the three posterior, 

 sparsely ciliated ; coxa of each of the three posterior paii-s double- 

 plated, the basos articulating between them ; the basos produced 

 posteriorlj- and superiorly, excavate beneath, but less in the pos- 

 terior pair, where the infero-j^osterior angle is produced into a 

 too til ; dactylos long, stylifomi. Three posterior pail's of pleopoda 

 subequal, the penultimate being rather the longest ; the rami clean, 

 lanceolate. Telson long, narrow, pointed, the apex being split like 

 a pen. 

 Length about 1 1 inch. 



Hah. Baffin's Bay (Sir J. Parry). The drawing and description 

 are taken from a female specimen in the British Museum. Spitz- 

 biTgen: presented to the British Museum by the Lords of the 

 Admiralty. IgooKk, where it is especially ahwndinwt^Sir James C.Ross, 

 Appendix to Second Voyage in Search of a N."\V. Passage, p. xc). 

 Northei-n Ocean : Specimen 323 E, Hunterian Museum {Sir John 

 Franklin, Ii..N., 1818). 



3. Aniphithonotus cataphractus. 



Amphitonotus cataphractus, Stinipson, Marine Invert, of Grand 3Ianan, 

 p. 52. 



" Body robust. Pereion very stout, with seven carina^; extending for 

 greater or les8 distances on the back and sides : \\'l. one strong 

 median dorsal carina commencing on the first segment, becoming 

 strongly dentate on the last, and ceasing on the second segment of 

 the pleon ; the next two carina? (proceeding outwards) are deve- 

 lojjcd in the form of strong teeth on the last two segments of the 

 pereion and on all the scg-ments of the pleon, being spLne-like on 

 the second, and almost lamelliform on the last four segments of 

 the pleon ; the next two carina; are sharp ridges extending along the 

 bases of the coxae, and slightly continued on the first two segments 

 of the pleon ; the last two or outer carina; are veiy short, extending 

 only along the basa of the last three paii's of pereiopoda. Coxae 

 large, angular. Cephalon with very large, rounded, convex eyes, 

 and a rostinim of great size, which is elongate-triangular, pointed, 

 curving downwards, concave above, and with a sharp median 

 ridge below. Antenntc slender, about equal in length, and one- 

 fourth the length of the body. Gnathopoda subequal ; the pro- 

 poda large, ovate, dentate below ; dactyla curved, and about two- 

 thirds the length of the propoda : carpi* inferiorly j^roduced. 

 Pereiopoda slender ; basa of the three posterior pairs but slightly 

 * •'Antepenult joints \Tith slight thumbs." — Avct. fcxf. 



