NO. 14 manter: digenetic trematodes of fishes 403 



Discussion. The specimens from the Pacific were so similar to the 

 specimen from Anisotremus virginicus that an earlier description for the 

 latter fitted the former in almost all details. Figures of both (figs. 87 and 

 89) reveal the differences. The Atlantic form (fig. 89) is somewhat more 

 contracted, a condition probably explaining the folded prepharynx. The 

 chief difference is the larger size of the cirrus sac in the Atlantic form 

 where it reaches beyond the ovary. Since the body contraction might be 

 involved here and since individual variation might also be a factor, that 

 difference alone is not considered sufficient to warrant a species. The 

 spines of the cirrus sac seem longer in the Pacific form, but the entire cir- 

 rus apparently varies greatly with contraction. In the Atlantic form it 

 was inserted into the genital atrium (without extension through the geni- 

 tal pore) and back as far as the spiny region of the metraterm. In the 

 Pacific form it was retracted seemingly by inversion, much like a 

 proboscis. 



It is of interest to note that another specimen of Anisotremus inter- 

 ruptus from James Island contained Ha?nacreadium oscitans Linton, 

 which is likewise found in A. virginicus at Tortugas, Florida. 



Specimens of what seems to be this same species were collected by 

 Dr. A. O. Foster from Anisotremus pacifici (Giinther) from Miraflores 

 Locks in the Panama Canal in 1937. These specimens varied considerably 

 in size and were somewhat contracted. Most of them were smaller than 

 the other collections. A 0.397 mm specimen was immature, but one, 0.435 

 long, contained eggs. The Panama Canal material agrees with P. longi- 

 caecum in sucker ratio, egg size, length of ceca, and terminal genital 

 organs. 



Proctotrema costaricae, new species 

 (Plate 44, fig. 90) 



Host: A yellow-striped grunt or porgy, possibly of the genus 

 Medialuna, taken in nearly fresh condition from the 

 stomach of Seriola species 



Location: Ceca and intestine 



Locality: Port Culebra, Costa Rica 



Number : 4 specimens 



SPECIFIC DIAGNOSIS OF PROCTOTREMA COSTARICAE 



Body oval to elongate, 0.786 to 0.995 by 0.397 to 0.450, rounded at 

 each end, anterior end somewhat truncated ; spined except near posterior 

 end (in two specimens spines were lost). Oral sucker terminal, funnel 



