
24 RECORDS OF THE S.A. MUSEUM 
The features distinguishing Cryptopontius from Dyspontius given by Gies- 
brecht (1899, p. 114) would appear to be better than those used by Wilson (1932, 
p. 594) since the length of the siphon varies in both genera. The most reliable 
character is the armature of the first exopod: Dyspontius has only two outer 
spines on the end segment whereas Cryptopontius | has three. 
Sheeran en oat led tay ala. deiraton piers Btw amedate 
Key To THE GENERA, 
1, Rami of first four pairs of legs 3-segmented aa tA 
Rami of first three pairs of legs 3-segmented, fourth pair different 5. 
Rami of first pair 2-segmented, fourth legs without endopods Pteropontius Giesbrecht 1895. 
2. Second antenna biramous.. ay an 3s os5 Be 
Second antenna uniramous, 4- -segmented . =f + Urogonia Brady 1910. 
3. Fourth endopods reduced in size, with gaint setae; maxillae and maxillipeds of slender 
structure Bradypontius Giesbrecht 1895, 
Fourth endopods not reduced, setae normal; maxillae and maxillipeds strongly built .. 4. 
4, Posterior corners of head conspicuously notched; epimeral plates pointed dlagimbthy: out- 
wards; genital segment about as wide as long Cribropontius Giesbrecht 1899. 
Posterior corners of head entire; epimeral plates curved backwards parallel with body axis; 
genital segment twice as wide as long .. Sestropontius Giesbrecht 1899. 
5. Fourth endopod 2-segmented . is Rr . 6. 
Fourth endopod replaced by a ‘process, seta, spine, or ‘lacking av : . 8 
6. Body longer than wide, thoracic segments free; urosome 4-segmented in female, forming 
one-fourth of total length .. 7. 
Body as wide as long, sub-cireular, third and fourth thoracic segments fused; urosome 3- -seg- 
mented in female, less than one-sixth of total length . ws Discopontius gen, nov. 
7. Body with well developed epimera; siphon short and siandnts with suctorial tube 
Arctopontius Sars 1915. 
Body without epimera, segments rounded; siphon short and stout, without suctorial tube 
Metapontius Hansen 1923. 
8. Second antenna 5-segmented, second segment with 2-segmented exopod; first antenna 18-seg- 
mented; urosome 3-segmented, last two segments very short 
Cletopontius Thompson and Scott as 
Second antenna 4-segmented, second segment with one-segmented exopod 
9. Urosome 3-segmented, ier covered by last metasome segment, fifth legs 15 times as 
long as wide Lepeopsyllus RPE HS and Scott 1903. 
Urosome entirely free dorsally ; ; . fifth legs as wide as long ii »e- Ae 
10. Head wider than long; distal segment of first exopod with two spines 
Dyspontius Thorell 1889, 
Head longer than wide; distal segment of first exopod with three spines 
Cryptopontius Giesbrecht 1899. 
Genus Crypropontius Giesbrecht. 
Giesbrecht, 1899, pp. 30, 89, 108; Sars, 1915, p. 120. 
The genus contains six species: thorelli, tenuis, capitalis and brevifurcatus 
(Giesbrecht) 1895; innominatus Brady 1910, and gracilis Wilson, 1932a. Four 
new species are described below and a key is given for the identification of the 
various species. 
Key T0 THE FEMALES. 
1. Caudal rami wider than long . és te . i eee xe 
Caudal rami at least as long as wide —- aia - aap ae 
2, Urosome forming little more than one-fifth of the total length brevifurcatus (Giesbrecht). 
Urosome forming at least one-fourth of the total length she longipes sp. nov. 
3. First antenna with second segment shorter than first and third .. $e vee A 
First antenna with second segment longer than either first or third innominatus Brady. 
First antenna with first two segments sub-equal a's nal proximus sp. Nov. 
4. Siphon reaches beyond the base of the first legs ar as ray -. 5. 
Siphon does not reach the base of the first legs es mn ° 3 + 8 
