Boone — CALAMURA PORTERI 
31 
blade is concave-convex; the inner blade of the second 
pleopod consist of two parts a slender spinelike projec- 
tion along the inner margin^ similar to that of the first 
pleopoda but not fringed with hairs and a tiny ovate- 
convex slightly inflated blade which is almost as large, 
and fits into the concavity of the outer blade; this blade 
is composed of a tough skin which is netted with coarse 
veins, the Avhole being inflated until quite taut and tipped 
distally with several multisetose tree-like spines. The 
third pleopoda consists of an outer blade similar to that 
of the second pleopoda, but slightly smaller, and an inner 
blade of only one part, a tiny, cylindric balloon-shaped 
organ, which is almost as large and fits into the concavity 
of the outer blade, similar to that of the second pleopod. 
The fourth and fifth pleopoda are similar to third, but 
graduatingly slightly smaller. 
The marsupial pouch extends from the base of the 
second legs to the posterior margin of the seventh thora-' 
cic segment; it is composed of six pairs of subrhomboidal 
plates which spring from the posterior six thoracic 
segments. 
The genotype, an adult male. Cat. No. 50411, U. S. 
IS. M., an adult female paratype and 5 additional speci- 
mens, Cat. No. 50412, U. S. N. M., were collected at Pi- 
sagua, Chile, June, 1912 (orig. no. 7), by Prof. Carlos 
Porter, for whom I take pleasure in naming the species. 
Explaiiiition of Plate II: 
Fig. 1. Calaiiiura Porteri, adult male-dorsal sketch. 
Fig. 2. Calaniura Forteri, adult female-dorsal sketch. 
Fig. ?). Calaimira Porteri, superior antenna, lateral view. 
Fig. 4. Calamura Porten, inferior antenna, lateral view. 
Fig. 5. Calamura Porteri., second pleopod. 
Fig, 6. Calamura Porteri, third pleopod. 
Fig. 7. Calamura Porteri. fourth pleopod. 
Fig. 8. Calamura Porferl^ fifth pleopod. 
Fig. 9. Calamura Porteril gnatliopod. 
Fig. 10. Calamura Porteril fifth leg. 
