406 CRUSTACEA ENTOMOSTRACA. 



Fam. 4. Peltidiidae. Free -living marine forms, with feeble swimming 

 power. The body is broad and flattened and the margins of the anterior 

 segments are often produced into overlapping lobes. The cuticle is thick. 

 In other respects they resemble the Harpactidae. Scutellidium Glaus, 

 Zaus Goods., Alteutha Baird, Eupelte Claus, Peltidium Phil. Porcellidium 

 Claus, body incompletely segmented. Hersilia Phil. 



Second series (Fams. 5-8). 



Fam. 5. Cyclopidae. Marine and freshwater forms with active 

 swimming powers. Body pear-shaped completely segmented. Last 

 thoracic segment included in urosome. Anterior antennae of moderate 

 length, both of them symmetrically modified as prehensile organs 

 in the male (Fig. 258). Posterior antennae uniramous, 4-jointed. 

 Mandibular and maxillary palps reduced. 5th pair of swimming feet 

 cylindrical and alike in both sexes. Heart generally absent. Eye median 

 simple. Egg sacks paired. Cyclops Mull. (Fig. 257), mandibular palp 

 reduced to a few bristles (Fig. 259, M). Abundant in freshwater pools. 

 Cyclopsina Claus. Oithona Baird, 0. plumi/era Baird, pelagic. The 

 appendages of the female are beset with long feathery scarlet setae not 

 present in the male. Misophria Boeck, Thorellia Boeck. 



Fam. 6. Notodelphyidae. Cyclops-Mke Copepods, with diminished 

 powers of movement, commensal in the interior of Tunicates and other 

 marine animals. Body fully segmented. The anterior antennae of 

 moderate length or with the number of joints reduced to 5. The eggs 

 develop in a wide expansion of the united oviducts (uterus) contained in 

 a large dorsal expansion of the fused 5th and 6th thoracic segments. Cement 

 glands absent. The males are often much smaller than the females. Noto- 

 delphys Allm. differs from the other genera in having the anterior antennae 

 as long as the cephalothorax. Doropygus Thor., Botachus Thor., Gonio- 

 delphys Buchh., Notopterophorus Costa, with lamellate dorsal processes 

 on the thoracic segments. Gunentophorus Costa, Chonephilus Sars, and 

 (?) Gastrodes Hesse, and Ophthalmopaches Hesse. 



Fam. 7. Ascidicolidae. Resembling the Notodelphyidae in mode of 

 life and in structure except that the body is more elongated, and the 

 anterior antennae are shorter 3-jointed. Ascidicola Thor., Botryllo- 

 philus Hesse, Narcodes Hesse, Ischnogrades Hesse, Ophioseides Hesse, 

 Entetocola Bened., Mychophilus Hesse, Ad.rane.sius Hesse, Aplopodus 

 Hesse, and (?) Podolabis, Cryptopodus, Hypnodes and Lygephilus Hesse. 

 Enterognathus Giesb., E. comatulae an entoparasite on Comatula. 



Allied to the Ascidicolidae are the forms Thaumaleus Kroyer, Mon- 

 strilla Dana and Haemocera Malaquin, whose remarkable life-history is 

 described above (p. 403). 



Fam. 8. Buproridae. Consisting of the single species Buprorus loveni 

 Thor., commensal with Ascidia aspera Mull. Allied to the last two 

 families but the body of the female unsegmented. 



Third series (Fams. 9-11). 



Fam. 9. Corycaeidae. Active, marine Copepods, mostly free through- 

 out life, though in some species the females become temporarily attached 

 to other animals. Body cylindrical or flattened. Anterior antennae 

 short, usually 6-jointed, alike in both sexes. The posterior antennae and 



