CUMACEA 287 



by its second peraeopods, the shape of the pseudorostrum, and the telsonic somite. /. crassipes 

 Hansen is peculiar in the development of the merus of the third maxilliped and in the proximal 

 joint of the endopod of the uropod which is longer than the distal joint. /. hupferi Zimmer is a 

 much smaller species (5 mm.) and has the proximal joint of the inner ramus of the uropod only a 

 little shorter than the distal joint. /. robusta Hansen (female unknown) has in the male a number of 

 lateral carinae on the thoracic and abdominal somites, while the pseudorostral lobes are very short. 

 /. zimmeri Stebbing has only four free thoracic somites and is doubtfully referable to Iphinoe, and 

 /. brevidactyla Hale and I. truncata Hale are both smaller species, brevidactyla having the endopod 

 of the uropod with the first joint longer than the second, while in truncata the two joints are subequal. 

 The following key should enable the known species of Iphinoe to be distinguished from each other. 

 Species which are doubtfully included in the genus, or about which further information is required, 

 are enclosed within square brackets : 



10 



11 



12 



13 



14 



15 



16 



17 



KEY TO SPECIES OF IPHINOE 



Uropod with 1st joint of endopod shorter than 2nd. 



Uropod with 1st joint of endopod longer than 2nd or joints subequal. 



Uropod with 1st joint of endopod only slightly shorter than 2nd. 



Uropod with 1st joint of endopod at most three quarter length of 2nd. 



Antennal notch very shallow and antennal tooth of carapace not developed. 



Antennal notch and antennal tooth well developed, at least in $. 



Three pairs of lateral carinae present on last three pedigerous somites (<J). 



No lateral carinae. 



Carpus of 3rd maxilliped widened distally on median side. 



Carpus of 3rd maxilliped not widened distally. 



2nd peraeopod shorter than 3rd. 



2nd peraeopod as long as 3rd. 



Pseudorostral lobes acutely produced anteriorly. 



Pseudorostral lobes blunt anteriorly. 



Distal joint of 1st antenna with two aesthetascs. 



Distal joint of 1st antenna with one aesthetasc. 



Exopod of uropod bearing setae on external side of distal joint. 



Exopod of uropod without setae on external side of distal joint. 



Basis of 1st peraeopod shorter than remaining joints together. 



Basis of 1st peraeopod at least as long as remaining joints together. 



Carapace less than twice as long as high. 



Carapace at least twice as long as high. 



Prolongation of basis of 3rd maxilliped reaching to end of prolongation of merus. 



Prolongation of basis of 3rd maxilliped not reaching to end of prolongation of merus. 



Abdominal somites with lateral articular pegs. 



Abdominal somites without articular pegs. 



Merus of 3rd maxilliped produced in a broad lobe reaching beyond end of carpus. 



Merus of 3rd maxilliped not produced in a broad lobe. 



Outer ramus of uropod shorter than inner. 



Rami of uropods subequal. 



Dactylus of peraeopods 3-5 very short, about one-sixth length of carpus. 



Dactylus of peraeopods 3-5 longer, about half length of carpus. 



Carapace with mid-dorsal serrations. 



Carapace without mid-dorsal serrations. 



2 



13 



3 



4 



I. sanguinea 



I. hupferi 



[I. robusta] 



5 



[I. zimmeri] 



6 



7 



8 



I. africana 



I. brevipes 



9 



10 



I. calmani 



I. serrata 



I. tenella 



11 



I. inermis 



12 



I. fagei sp.n. 



I. trispinosa 



I. pellucida 



14 



15 



16 



[I. macrobrachium] 



I. crassipes 



I. brevidactyla 



17 



I. tenella var. 



I. truncata 



The damaged specimen mentioned by Fage (19516) may probably be referred to the new species 

 described here. 



