Civ PROCEEDINGS OP THE GEOLOGICAL SOCIETY. [May 1 896, 



Prof. Dames has described and figured two supposed larval 

 forms of Crustacea from the Cretaceous of the Lebanon, under the 

 names of Pseuderichthus cretaeeus and Prolozoea Hilgendorfi, which, 

 in the long produced fore-and-aft spines on the carapace, call to 

 mind the larvae of Hippa, Porcellana, and of some other living 

 Decapoda. 



Palinuridjs. — In Pdlinurus the carapace is less expanded and is 

 longitudinally subcylindrical, with the orbits partially excavated and 

 the eyes protected by strong spines ; the external antennae are very 

 thick and long, their basal joints strong and spinous. The internal 

 antennae are principally composed of three long joints, with two small 

 flagella at their extremities. All the feet are monodactylous. The 

 tail is very broad, and the outer lamella is not jointed. 



Pdlinurina longipes, Miinster, is found in the three divisions of 

 the Lias of England, and in the Lithographic stone of Solenhofen, 

 Bavaria, and other localities. 



Pdlinurus {Glyphced) Scemanni, Oppel, sp., and P. Woodivardi, 

 Pritsch, come, the former from Solenhofen, and the latter from the 

 Chalk of Bohemia. P. nanodactylus, Schl., sp., is from the Chalk 

 of Sendenhorst, Westphalia. 



Cancrinus claviger and Cancrinus latipes make us acquainted 

 with a very remarkable Palinurid from Solenhofen, in which the 

 outer antennae are developed into large multiarticulate club-shaped 

 organs. 



Here is also placed a singular crustacean with simple monodactyle 

 thoracic limbs, from the Lower Lias of Barrow-on-Soar, Leicester- 

 shire, named by me Prceatya seahrosa. 



Archceocarabus Bowerbanlcii, M'Coy, carries the Palinuridae on into 

 the Eocene Tertiary strata, and the Pdlinurus vulgaris (or common 

 ' Spiny * Crawfish) is living around the rocky parts of our own 

 coasts and those of Prance and the Mediterranean, and elsewhere, 

 abundantly to-day. 



There are several fossil forms of long-armed monodactylous crus- 

 taceans which have been placed here, presumably for convenience ; 

 beginning with JScapheus ancylochelis, H. Woodw., from the Lower 

 Lias of Lyme Begis (Quart. Journ. Geol. Soc. vol. xix. 1863, pi. xv.) ; 

 Mecochirus Pearcei, M'Coy, and M. socialis, Meyer, sp., from the 

 Oxford Clay of Christian Malford, Wiltshire ; Mecochirus Peytoni, 

 H. Woodw., from the Kimmeridge Clay, * Sub-Wealden Boring/ 

 Sussex ; and represented by six long-armed species from the Litho- 

 graphic Stone of Solenhofen Bavaria. These singular forms were 



