158 Cumacea: 20. Lampropidae, 3. Platytyphlops 



Synopsis of species: 



j Carapace with pair of conspicuous dorsal processes . . . 1. P. peringueyi 

 ) Carapace without conspicuous dorsal processes y. P. orbicularis 



1. P. peringueyi Stebb. 1912 P. p., T. Stebbiug in: Ann. S. Afr. Mus., r. 10 v 

 p. 159, 162 t. 58, 59. 



Pseudorostral lobes short, upturned. Carapace rounded oval, rather 

 longer than broad, the carinate margin fringed with pellucid scales, ocular 

 lobe small, triangular, frontal lobe broad, medio-dorsal line arched, finely 

 serrate to beyond the middle of the carapace, which in its hinder part has 

 a submedian pair of carinae rising into thin round-topped processes. Pedi- 

 gerous segments combined equal about half the length of the carapace, the 

 first shorter and much narrower than the second, the second and third 

 depressed and spread out at the sides, though still much narrower than the 

 carapace, the fifth not wider than the pleon, which is much longer than the 

 preceding part of the body. Telson much longer than the preceding segment, 



shorter than the peduncle of the uropods. with 

 anal opening near the base, thence narrowing to 

 the truncate 3-spined apex: 3 pairs of spines are 

 spaced on the margins of the hinder half, the 

 largest pair being subapical. Antenna 1, peduncle 

 rather longer than the flagella. its P* joint more 

 than twice as long as the 2"*^, 3<^ a little shorter 

 than ^"'i, principal flagellum 5-jointed (or in Q 

 perhaps (i-jointed), accessory 4-jointed. Antenna 2 

 of 9 with 3 plumose setae on P* joint, which is 

 rather large, but much shorter than the very slender 

 p.periiigueyu?rstebbing. an. 'i*^ 3^ with tooth near the base. Upper lip emar- 

 tenna 2. ginate. Numerous spines in spine-row of mandibles. 



Filaments of palp of maxilla 1 very unequal. Epi- 

 pod of maxilliped 1 with 7 unequal branchial leaflets. First peraeopods 

 reaching much beyond carapace, second joint in first and second pairs shorter 

 tiian following joints combined, 6*^> joint longest of these in the first pair but 

 very short in the second: third and 4*^ pairs alike in 6 and 9, except for 

 minuteness of exopods in the 9 . Fifth peraeopods pellucid, vestigial, but 

 the 2"*^ joint, as in the 2 preceding pairs, longer than the following joints 

 combined. Peduncle of uropods a little longer than the endopod. the 3 

 joints of which have on the medial margin 8 or 9, 3 or 4, and 2 spines 

 respectively: the exopod is a little longer than the telson. which equals the 

 first 2 joints of the endopod. L. about 10 mm. 



South Africa, Cape Point E. by N. 29 miles, and Bio E. 32 miles. 



2. P. orbicularis (Calm.) 1905 Platyaspis 0., Caiman in: Sci. Invest. Fish. 

 Ireland, 1904 app. 1 p. 12, 42, 43 t. 5 f. 77— 81 | 1912 Par alamprojJS 0.'^, Caiman in: P. 

 U. S. Mus., j;.41 p. 631 tf. 29— 39 | 1912 Platytyphlops 0., T. Stebbing in: Ann. S. Afr. 

 Mus., V. lOv p. 144, 161. 



Like F. peringuei/i, but carapace rather broader than long, VI 5 long 

 by 1"8 mm broad; a pair of low submedian carinae on the hinder half; 

 P* pedigerous segment larger than those which follow it; antenna 1 with 

 both flagella 4-jointed: antenna 2 9 with 2 plumose setae on the small 

 P* joint, 4*'^ joint narrowly fusiform; first peraeopods (as figured) not longer 

 than the carapace. The specimen defective beyond the P* pedigerous seg- 

 ment. Complete specimens, of which the specific identity is rather uncertain, 



