4 Goel, 
CCELENTEBATA. 
The Hydroid-polyps are further classified thus : — 
Hydropolypi. 
Ord. 1. Intceniolatce. 
Fam. 1. Hydrincc : Hydra. 
2. Campanularinoe : Campanularia, Obelia , Lafoca , &c. 
3. Sertularincc : Sertidaria , Plumidaria , &c. 
Ord. 2. Tamiolatce. 
Sub-Ord. a. Acolloblastce. 
Fam. 1. Clavidca : Turris , Cordylophora , Corydendrium , 
Clava. 
2. Corynidm : Coryne , Syncoryne, Zanclea. 
3. Atractylidce : Atractylh , Perigonimus , Garveia , 
Dicoryne , Binncria, Bougainvillea, Diplura. 
4. JEudendruhe : Eudendrium. 
5. Eydractinidce : Hydractinia. 
6. Podocorynidce : Podocoryne, Corynopsis. 
7. Cladonemidce : Cladonema. 
8. Nemopsidce : Nemopsis. 
9. Pennaridce : Pennaria , Stauridium, Vorticlava, &c. 
10. Cladocorynidce : Cladocoryne. 
11. Myriodielidce : Myriothela. 
12. Clavatellidce : Clavatella. 
13. Monocaulidce : Monocaulii. 
14. Tubidaridcc : Tubularia , Corymorpha , Ectopleura , 
Hybocodon, Amalthcea , Acaidis. 
Sub-Ord. B. Colloblastce. 
Fam. 1. Spongicolidce : Sptongicola. 
2. Scyphistomidce. 
Tho author describes one now species of Podocoryne , P. liceckeli, and 
one of Plumidaria, P. fragilis. In conclusion, he discusses the subject 
of histiogenesis as exemplified in the Hydroid-polyps. 
18. . Studien fiber Ccelenteraten. Jen. Z. Nat. xv. pp. 545-557. 
The author deals with the nematophores among the Hydroida , and 
with the pseudopodial cells of Hydra. The nematophores develope in 
interstitial ectodermal cells. The author thinks it possible to contrast 
Hydra with all other Hydroid-polyps, on account of certain pseudopodial 
ectodermal cells which he describes as occurring at the base, and which 
are absent in other Hydroids, and he considers this to be evidence in 
favour of the primitive and ancestral nature of Hydra. 
19. Holm, G. Bidrag till kaunedomen om Skandinaviens Graptoliter. 
Trenne nya Slagten af familien Dichograptidse Lapa. CEfv. Ak. 
Forh. xxxviii. pp. 45-51. 
[The Recorder has not seen this paper.] 
20. Hopkinson, J. On some points in the Morphology of the Rhabdo- 
phora , or true Graptolites. Ann. N. II. (5) ix. pp. 54-57. 
This memoir is based upon an examination of a collection of Grapto- 
lites made by Mr. Dover from the Skiddaw slates. Some of these are 
