REPORT ON THE CRUSTACEA MACRURA. 557 



Habitat. — Off Honolulu, Sandwich Islands; depth, 18 fathoms. One specimen; 

 female. 



Observations. — This species is one of those that approach Athens n&ptunus, Dana 

 (PI. CI. fig. 2), and Atyheus biunguiculatus, Stimpson. It differs from the former in 

 having the carpos of the third and fourth pairs of legs anteriorly produced at the upper 

 distal extremity, and in having the dactylos biunguiculate, and from the latter (PI. CI. 

 fig. 4) in being generally more robust, in having the rostrum and supraorbital teeth less 

 prominent, the carpos of the third pair of pereiopoda produced on the upper margin, and 

 the dactylos short and thick, the second unguis being rudimentary and situated behind 

 the larger on the outer margin. 



Our specimen is a female and carries a very large mass of ova, which are oval ; hence 

 the specific name. 



Athens intrinsecus, n. sp. (PI. C. fig. 1). 



Dorsal surface arched from the frontal margin of the carapace to the telson. Carapace 

 and pleon smooth. Rostrum reaching to the extremity of the first joint of the first 

 pair of antennse. A sulcus separates the rostrum from the orbital lobes, which are 

 armed with a sharp tooth on the inner dorsal surface. 



The first pair of antennse has the first joint armed with a stylocerite that is broad, 

 sharp pointed, and reaching to the extremity of the first joint, which is hollowed on the 

 upper surface and furnished with a small bunch of hair. The terminal flagella are 

 unequal in length and size, the inner one being nearly as long as the animal. 



The second pair of antennas has a scaphocerite that reaches to the distal extremity of 

 the peduncle of the first pair of antennse, terminates in a sharp rigid point united to the 

 inner squamous part nearly as far as the extremity, towards which it gradually narrows 

 from the base ; at the extremity of the previous joint is a sharp but not long tooth. 

 The terminal joint of the peduncle reaches as far as that of the first pair, and carries a 

 flao-ellum twice the lena;tli of the animal. 



The first pair of pereiopoda is unequal, that on the left side (fig. Ik) being the smaller 

 and more normal. It has the meros long and not excavated to receive the posterior lobe of 

 the carpos, and is crenated along the lower margin ; carpos long, triangular ; propodos long 

 and narrow, scarcely broader than the anterior diameter of the preceding joint ; dactylos 

 resembling the pollex, being long, straight, and slightly curved at the distal extremity. 

 That on the right side has the meros slightly excavated to receive the posterior lobe of 

 the carpos ; carpos short, broader than long, propodos large and wide, armed with a tooth 

 on the upper surface, with a sulcus anterior to it, and two small sharp teeth, one on each 

 side of the dactyloid articulation ; on the lower margin, corresponding in position, are two 



