1908] - Decapod Crustaceans. 19 
Trypom however states in his deseription of the only specimen at 
his disposal—a male—that: *on the first abdominal segment is å 
pair of rudimentary one-jointed feet, without terminal plates'. The 
presence of these feet does not constitute any sexual difference.” 
In Calocaris Macandreae this pleopod is well developed. 
The 6th Pleopod both in U. erassipes and OC. coromatus has 
a very distinet suture on the exopodite, differing in this respect most 
decidedly from Paraxius altus, Hicomaxius, et alia. 
It is especially the presence of *stylocerite” and *scaphocerite” 
on the pedunele of the 2nd pair of antennae which has led Spence 
Batz to establish the senus Eiconaxius. "The stylocerile”, says 
Mr. Batz in his generic description, "which is present in this genus 
in wanting in Axis as it is in all the Macrura except Ficonaxius 
and Cheiroplatea.” However, in his generic description of Cheiro- 
platea, å genus also established by him, nothing is said about this 
distinguishing mark for these two Macrura. In this connection 
Trysom!) calls attention to the fact that the species Axius plecto- 
rhynchus deseribed by StTrarrL?) must undoubtedly be assigned to 
the genus Ficonaxius, and Try»om further adds to it SmirrH's 
species Axwus armatus which he terms Eiconaxius armatus, SMITH. 
As long ago as 1895 W. Faxon*) proposed that the senus 
Eiconaxius should be done away with, pointing out that *in the 
figures of Axius stirhynehus given by Leaca*) and Mine Enwarns*) 
a short stylocerite is discernible, and in some of the species referred 
to Axius by recent authors, this structure appears to assume larger 
proportions. For instance in Azxius armatus, SMITH 9) the stylocerite 
is described as slender, acute, and more than half as long as the 
rest of the segment, while the acicle (scaphocerite) is slender, straight 
1) "Two new species &c.,” (1904). 
2) SrrRaHL: ,Ueber einige neue von Herrn F. JaGor eingesandte Thalas- 
siniden, etc.* Monatsbericht d. Königl. Preuss. Akad. d. Wiss. zu Berlin, 1861. 
2te hefte. Juli—Decemb. S. 1060—1062, fig. 2—4. 
3) W. Faxon: "The stalk-eyed crustacea”. Mem. of the Mus. of Comp. 
Zoology at Harvard College. Vol. XVIII. XV (Cambridge U. S. A.) 1895. 
3 Malacostraca Podophth. Brit. Pl. XXXIII, fig. 2. 
9) Cuvizr's Régne Animal, Disciples' ed. Pl. XLVIII fig. 2 a. 
SØREOCGENE SNat Mus 0433: 1881. 
31 
