98 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.21 



was necessary for Inachoides mkrorhynchus to be present in great num- 

 bers, and at one station 420 specimens were taken. 



Depth: 5-18 fathoms. 



Size and sex: The 30 mm male holotype is the largest specimen on 

 record. The largest male and female in the Sechura Bay series are the 

 measured pair above. However, females carrying eggs were found which 

 measured no more than 5.6 mm in length. Sex was readily determinable 

 in the smallest specimens present, 4.4 mm males and 4.0 mm females. 



Breeding: At the time of the 1935 Hancock expedition to Peru, mid- 

 January, approximately one-half of the females examined were with ova, 

 the proportions being 14 out of 28 in one series, 5 out of 11 in another, 

 and 4 out of 9 in a third. At the time of the 1938 expedition, February 

 10-15, 8 of 11 females examined in one lot had the full complement of 

 eggs and the remainder gave evidence of having but recently shed them. 

 January and February are mid-summer months in the Southern 

 Hemisphere, corresponding to July and August in the Northern 

 Hemisphere. 



Remarks: The northern limit of range of the species appears to be 

 Sechura Bay, although dredging in the Gulf of Guayaquil might extend 

 this somewhat. It is quite well established through specimens obtained by 

 the Velero III that the species of Inachoides occurring north of Punta 

 Santa Elena, Ecuador, is Inachoides laevis. 



To one coming from California to Peru, the similarity between 

 Inachoides mkrorhynchus and Pyromaia tuberculata (Lockington) is 

 striking. It is therefore not surprising to find that the relationship is 

 more than superficial, extending to the orbits and to the dactyli of the 

 young (see Rathbun, 1925, p. 136), and, as here shown, to the male 

 pleopod (Plate E, fig. 9). Fortunately there is no overlap in the ranges 

 of the two species, permitting segregation on a geographical basis. 



Although written more than a century ago, the lucid French descrip- 

 tion of the elder Milne Edwards, quoted above, bears critical judgment 

 by modern standards, and needs only to be supplemented as regards 

 cheliped and antennal article to be entirely acceptable. 



Inachoides laevis Stimpson 

 Plate E, Fig. 6 ; Plate 6, Fig. 4 



Inachoides laevis Stimpson, 1860b, p. 192. A. Milne Edwards, 1879, 

 p. 200. Rathbun, 1910, p. 570; 1925, p. 61, pi. 22, figs. 3-6 (part: 

 not synonymy, not text-fig. 17; Lower Californian and Panamanian 

 specimens only). Crane, 1937, p. 53. Garth, 1948, p. 22. 



