1228 THE VOYAGE OF H.M.S. CHALLENGER. 



The Person seldom or never 1 carrying seven pairs of fully developed limbs. 



Branchial Vesicles on the second, third, and fourth, or only on the third and 

 fourth, segments of the perseon. 



Pleon with one, two, or five segments. 



Uropods. — Two pairs, one or both being sometimes scarcely appreciable. 



The name Caprelhdse for this family appears first, so far as I remember, in White's 

 List of the specimens of Crustacea in the collection of the British Museum, 1847 ; 

 in 1857 White gave the following definition : — 



" Body ' elongated, cylindrical, and very narrow. Four well-developed antenna?. 

 Legs long and slender. Coxae fused with the body of the animal. Animals not 

 parasitic." 



For Kr0yer's definition of his equivalent subdivision, Caprellina, see Note on 

 Kr0yer, 1843 (p. 202). For Mayer's definition of the family Caprellidae, see Note on 

 Mayer, 1882 (p. 535). Mayer describes the genera known to him in the following 

 order, Cercops, Proto, Caprellina, Protella, jEgina, ^Eginella, Caprella, Podalirius. 

 Accepting this order as far as the older genera are concerned, I insert the genus 

 Dodecas after Proto, change the name Caprellina into Caprellinopsis, provisionally 

 placing the new genus Caprellinoides immediately after it, and following this by the 

 new genus Protellopsis, finally allowing the preoccupied name AZgina to be absorbed 

 in JEginella. 



Genus Proto, Leach, 1814. 



1814. Proto, Leach, Crustaceology, Edinburgh Encyclopaedia, vol. vii. p. 433. 



1815. „ Leach, Trans. Linn. Soc. Lond., vol. xi. pt. ii. 



1816. Proton, Latreille, Nouveau Diet, d'hist. nat., vol. v. 



1816. Leptomera, Latreille, Nouveau Diet, d'hist. nat., vol. v. 



1817. Proto, Latreille, Le Regne animal, t. iii. 



1817. Leptomera, Latreille, Le Regne animal, t. iii. 



1818. ,, Lamarck, Hist. nat. des Anim. sans vert., t. v. 

 1823. Proto, Fleming, Edinburgh Philosoph. Journal, vol. viii. 



1823. Leptomera (?), Fleming, Edinburgh Philosoph. Journal, vol. viii. 

 1825. „ Desmarest, Consid. gen. sur les Crustaces, p. 275. 



1825. Proton, Desmarest, Consid. gen. sur les Crustaces, p. 276. 

 1825. Proto, Guerin, Encycl. Meth. Hist. Nat., t. x. (under Proton). 

 1825. Leptomera, Guerin, Encycl. Meth. Hist. Nat., t. x. (under Proton). 

 1828. ,, Zenker, Das thierische Leben und seine Formen, p. 342. 



1828. Proto, Zenker, Das thierische Leben und seine Formen, p. 342. 



1829. Leptomera, Latreille, Le Regne animal, t. iv. 



1829. Naupredia, Latreille, Le Regne animal, t. iv. 



1830. Leptomera, Desmarest, Bosc's Manuel de l'hist. nat. des crust., t. ii., new edition. 



1 In Proto there are seven pairs of limbs, but the third peraeopods, though with the full number of joints, by their 

 comparative shortness indicate an arrest of development. 



