1906.] ox CYCLOPIA IN OSSEOUS FISIIKS. 443 



Plate XXVIII. 



Fig. 1. Spongodes zanzihareyisis, sp. n. End of a branch. X 20. p. 424. 



2. Spoiiffodes crosslaudi, up. li. X 20. p. 423. 

 Figi.3-9. W'ric/htella variabilis, sii.n. To show variations in colour. X 1"5. p. 431. 

 Fig. 10. Wrightella erythrcea Graj-. X 1'5. p. 430. 



Plate XXIX. 



Fig. 1, Leptogorgia ochracea, sp. n. p. 431. 



2. Sclerophytum viride, sp. n. Nat. size. p. 420. 



3. „ „ Group of polyps. X 8. 



4. Siiherogorgia kollikeri, vai\ zanzibai-ensis, n. X 1"5. p. 429. 

 Fig^s. 5-7. Lophogorgia crista Mobius. X 2. p. 432. 



Fig. 8. St/mpodium splendens, sp. n. X 12. p. 409. 

 9. Sympodium punctatum May. X 2. p. 408. 



Plate XXX. 



Fig. 1. SiphoHogorgia intermedia, sp. n. One polyp. X 14. p. 428. 



2. „ „ Four branches. X 2. 



3. Clavuha-ia pregnans, s]}. i\. X 12. p. 407. 



4. Clavularia fiava May. X 10. p. 402. 



5. Sympodium ftiscum, sp. n. j)- 403. 



6. Clavularia crosslandi, sp. u. X 10. p. 404. 



Plate XXXI. 



Fig. 1. (a) (6) (c). Coelogorgia repens, sp. n. Nat. size. p. 436. 



(d). „ „ Enlarged portion. X 12. 



2. Scleropliyttim polydactylum Dana. X 3. p. 418. 



3. Stereonephthya zanzibareiisis, sp. n. Colonj'. Nat. size. p. 425. 



4. „ „ Portion enlarged. X 16. 

 6. Spongodes kiikenthali, sp. n. X 16. p. 424. 



3. On Cyclopia in Osseous Fishes. 

 By James F. Gemmill, M.A., M.D. 



[Received February 20, 1906.] 



(Plate XXXII.*) 



I. Description; p. 443. 

 II. Summary of Anatomical Details: p. 447. 



III. Causation : p. 447. 



IV. Comparison with Cyclopia in Mammals ; p. 448. 



I. Desceiftion. 



Some time ago I obtained from the Lochwinnoch Trout hatchery 

 four young Trout just escaped from their egg-membranes, which 

 exhibited the condition of cyclopia. 



As I could not find that the anatomy of this very interestino- 

 abnoi-mality had previously been described in the case of any of 

 the lower vertebrates, I examined the specimens carefully in the 

 hope that some light might be thrown on cyclopia in the higher 

 forms. 



Classification. — The condition of the central nervous system 



* For explanation of the Pate, see p. J:-! 0. 



