346 M. A. Cronebe.rg on the 



to the Mediterranean and Madeira. A small number occur in 

 the Arctic seas. 



It may be convenient to identify as far as possible a number 

 of Heller's species which are probably referable to forms 

 already described when he wrote, and to note some of tlie 

 changes in the generic names : — 



Scrupocellaria capreolus, H., = ^. BerthoUetii, Aud. ; Dia- 

 choris simplex^ }i.,=^ Membranipora patellarin, Moll (sp.) ; 

 Mevihranipora hifbveoJata^ }i., = Ilicropora impressi^ Moll 

 (sp.); Lepralia cribrosa, H., = Crib, punctata^ var. ; Lepralia 

 Kirchenpauen, li.,? = L. adpt^essa, Busk; L. apipendicalata, 

 H., ?= 0. wiars2//jt'aio, Busk ; L. Steindachneri^ H., = Cri- 

 brilina Gattyw,^ Busk; Eschar a fascialis= Lejrralia foUacea, 

 form fascialis ; Eschara cervicornis, M. -Edwards, = Smitlia 

 cervicornis) Discosparsa patina^ H., = Lichenopora radiata, 

 Aud. ; Obelia tubuUfer<i, Lamx., = Idmonea serpens (young) ; 

 Valkeria verticillata, H., = llippuraria verticillata. 



EXPLANATION OF PLATE IX. 



Fi(j. 1. Flustra tenella, n. sp. 1 a, Avicularium. 



Fig. 2. Flustra sectirifrons, Pallas. Zooecia magnified, to show the rib- 

 like appendages protecting the opening of the ooecium. 2 a. 

 Avicularium. 



Figs. 3, 3 «, 3 b. Smittia trispinosa, Johnston, form spathulata, Smitt. 

 3 c. Spatulate avicularium. 



Fig. 4. Lepralia comijlanatn, Norman. 



Fig. 5. Cellepora rettisa, Manzoni, var. caminata, Waters. 



Fig. 6. Bowerbanhia liserialis, n. sp. An iuternode and its zooecia, mag- 

 nified. Qa. Portion of stem, showing a joint and the mode of 

 branching. 



Fig. 7. BtfsJcia socialis, n, sp. One of the groups of zooecia, magnified. 

 7 a. A single zooecium. 7 b. Nat. size. 



Fig. 8. Hippuraria verticillata, \le\\QY {s,^.). Zooecia. 8 a. A portion of 

 the stolon, with one of the nodular enlargements from which 

 the groups of zooecia originate. 



Fig. 9. Flustra pusilla, n. sp. Group of zooecia, with avicularia. 



Fig 10. Flustra membranaceo-truncata, Smitt. Zooecium with avicu- 

 larium. 



XL. — On the Structure of the Pseudoscorpions. 

 By A. Cronebeeg *. 



The circumBtance that a small Pseudoscorpion, Chernes 

 Hahnu, C. Koch, occurs pretty plentifully near Moscow 



* From the ' Zoologischer Anzeiger,' no. 246 (March 14, 1887), pp. 147- 

 161. A preliminary note. 



