758 



ARTHROPODA 



PHYLUM VII 



than the primitive caridoid forms may, however, justify some suspicion as 

 to its affinities. Praearcturus Woodward, from the Old Red Sandstone of 

 Herefordshire, has very slender claims to be admitted into 

 this order, and the same may be said of Amphipeltis Salter 

 (Devonian of Nova Scotia), and Arthropleura Jordan (Coal 

 Measures). 



Undoubted Isopods appear in Secondary rocks, Urda 

 Miinster (Fig. 1469), from the Kimmeridgian of Solenhofen, 

 has some very peculiar characters in which it approaches 

 the males of the Recent Gnathia, differing, however, in the 

 large size of the eyes. Cyclosphaeroma Woodward, from the 

 Great Oolite and Purbeck, resembles in general form some 

 Recent members of the family SiDhaeromidae, as do also 

 Archaeoniscus Milne Edwards (Fig. 1470), from the English 

 Purbeck and Eosphaeroma Woodward (Fig. 1471), from the 

 Eocene and Miocene. Palaega Woodward (Fig. 1472), 

 Cenomanian and Oligocene, has a general resemblance to 

 the Recent Aega and allied genera. Proidotea Racovitza and Sevastos, from 



A: A 



ttJl 



Fig. 1469. 



Urda rostrata Munst. 

 Litliographie Stone ; 

 Solenhofen, Bavaria. 

 Vi (after Knntli)- 



Fio. 1470. 



A, ArclMconiscus brodei 

 M. Edw. Purbeck ; Vale 

 of Wardour, Wiltshire. 3/j 

 (after Woodward). B, Frag- 

 ment of matrix, i/i (after 

 Quenstedt). 



Fio. 1471. 



A, Eusphaeroma bro7igniarti 

 M. Edw. Middle Oligocene ; 

 Butte de Chaumont, near 

 Paris, s/i (after Woodward). 

 B, Fragment of matrix, i/j 

 (.after Quenstedt). 



I)6...j;u:v 



Fig. 1472. 



I'alapija scrobiculatn (v. 

 Animon). Lower Oligo- 

 cene ; Hiiring, Tyrol, an. 

 Antennae ; o, Eyes ; jfi, 

 Uropod ; I-VII, Thoracic 

 segments ; 1-6, Abdominal 

 segments. 



the Oligocene of Roumania, is closely allied to the Recent Mesidotea in the 

 tribe Valvifera. 



Order 5. AMPHIPODA Latreille.i 



Body usually compressed laterally. Carapace absent ; first thoracic somite, more 



' Literature : Jlale, C. S., Catalogue of the .4inphipo(la in the Britis'h Museum, 1862. — Sars, 



